80912520 has 320 divisors, whose sum is σ = 312847920. Its totient is φ = 18579456.

The previous prime is 80912479. The next prime is 80912527. The reversal of 80912520 is 2521908.

It can be written as a sum of positive squares in 8 ways, for example, as 9036036 + 71876484 = 3006^2 + 8478^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (80912527) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 715984 + ... + 716096.

Almost surely, 2^80912520 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 80912520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156423960).

80912520 is an abundant number, since it is smaller than the sum of its proper divisors (231935400).

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

80912520 is a wasteful number, since it uses less digits than its factorization.

80912520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 80912520 is about 8995.1386870909. The cubic root of 80912520 is about 432.5190520303.

The spelling of 80912520 in words is "eighty million, nine hundred twelve thousand, five hundred twenty".