Base | Representation |
---|---|
bin | 1001101001010… |
… | …10110111100100 |
3 | 12122020221210200 |
4 | 10310222313210 |
5 | 131203302230 |
6 | 12010150500 |
7 | 2001526350 |
oct | 464526744 |
9 | 178227720 |
10 | 80915940 |
11 | 41747386 |
12 | 23122430 |
13 | 139c1271 |
14 | aa64460 |
15 | 7185160 |
hex | 4d2ade4 |
80915940 has 144 divisors (see below), whose sum is σ = 283046400. Its totient is φ = 18328320.
The previous prime is 80915911. The next prime is 80915941. The reversal of 80915940 is 4951908.
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a junction number, because it is equal to n+sod(n) for n = 80915895 and 80915904.
It is not an unprimeable number, because it can be changed into a prime (80915941) by changing a digit.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 187525 + ... + 187955.
It is an arithmetic number, because the mean of its divisors is an integer number (1965600).
It is a vampire number, since it can be written as 8940 ⋅ 9051 (with its own digits).
Almost surely, 280915940 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 80915940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141523200).
80915940 is an abundant number, since it is smaller than the sum of its proper divisors (202130460).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
80915940 is a wasteful number, since it uses less digits than its factorization.
80915940 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 602 (or 597 counting only the distinct ones).
The product of its (nonzero) digits is 12960, while the sum is 36.
The square root of 80915940 is about 8995.3287877653. The cubic root of 80915940 is about 432.5251458310.
The spelling of 80915940 in words is "eighty million, nine hundred fifteen thousand, nine hundred forty".
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