80812500 has 84 divisors (see below), whose sum is σ = 236246976. Its totient is φ = 21500000.

The previous prime is 80812489. The next prime is 80812553. The reversal of 80812500 is 521808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 187285 + ... + 187715.

It is an arithmetic number, because the mean of its divisors is an integer number (2812464).

Almost surely, 2^80812500 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 80812500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118123488).

80812500 is an abundant number, since it is smaller than the sum of its proper divisors (155434476).

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

80812500 is an equidigital number, since it uses as much as digits as its factorization.

80812500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 24.

The square root of 80812500 is about 8989.5772981826. The cubic root of 80812500 is about 432.3407590898.

The spelling of 80812500 in words is "eighty million, eight hundred twelve thousand, five hundred".