80975520 has 144 divisors (see below), whose sum is σ = 281808072. Its totient is φ = 21166080.

The previous prime is 80975513. The next prime is 80975551. The reversal of 80975520 is 2557908.

It can be written as a sum of positive squares in 4 ways, for example, as 75272976 + 5702544 = 8676^2 + 2388^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 75790 + ... + 76850.

Almost surely, 2^80975520 is an apocalyptic number.

80975520 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 80975520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140904036).

80975520 is an abundant number, since it is smaller than the sum of its proper divisors (200832552).

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

80975520 is a wasteful number, since it uses less digits than its factorization.

80975520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135 (or 1124 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 80975520 is about 8998.6398972289. The cubic root of 80975520 is about 432.6312787134.

The spelling of 80975520 in words is "eighty million, nine hundred seventy-five thousand, five hundred twenty".