81488704 has 28 divisors (see below), whose sum is σ = 176406048. Its totient is φ = 37040000.

The previous prime is 81488669. The next prime is 81488711. The reversal of 81488704 is 40788418.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57172 + ... + 58579.

It is an arithmetic number, because the mean of its divisors is an integer number (6300216).

Almost surely, 2^81488704 is an apocalyptic number.

It is an amenable number.

81488704 is an abundant number, since it is smaller than the sum of its proper divisors (94917344).

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

81488704 is a wasteful number, since it uses less digits than its factorization.

81488704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115774 (or 115764 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 40.

The square root of 81488704 is about 9027.1093933773. The cubic root of 81488704 is about 433.5432912860.

The spelling of 81488704 in words is "eighty-one million, four hundred eighty-eight thousand, seven hundred four".