80781900 has 72 divisors (see below), whose sum is σ = 237276480. Its totient is φ = 21215040.

The previous prime is 80781893. The next prime is 80781917. The reversal of 80781900 is 918708.

It is a super-2 number, since 2×80781900² = 13051430735220000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18091 + ... + 22109.

Almost surely, 2^80781900 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 80781900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118638240).

80781900 is an abundant number, since it is smaller than the sum of its proper divisors (156494580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

80781900 is a wasteful number, since it uses less digits than its factorization.

80781900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103 (or 4096 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 80781900 is about 8987.8751660223. The cubic root of 80781900 is about 432.2861829726.

The spelling of 80781900 in words is "eighty million, seven hundred eighty-one thousand, nine hundred".