80659440 has 120 divisors (see below), whose sum is σ = 280294560. Its totient is φ = 20762112.

The previous prime is 80659433. The next prime is 80659457. The reversal of 80659440 is 4495608.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×80659440² = 13011890522227200, which contains 22 as substring.

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 = 80659395 and 80659404.

It is a congruent number.

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, 18949 + ... + 22811.

It is an arithmetic number, because the mean of its divisors is an integer number (2335788).

Almost surely, 2^80659440 is an apocalyptic number.

80659440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80659440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140147280).

80659440 is an abundant number, since it is smaller than the sum of its proper divisors (199635120).

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

80659440 is a wasteful number, since it uses less digits than its factorization.

80659440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3911 (or 3902 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 80659440 is about 8981.0600710607. The cubic root of 80659440 is about 432.0676334438.

The spelling of 80659440 in words is "eighty million, six hundred fifty-nine thousand, four hundred forty".