81938704 has 45 divisors (see below), whose sum is σ = 166320549. Its totient is φ = 39104640.

The previous prime is 81938671. The next prime is 81938711. The reversal of 81938704 is 40783918.

The square root of 81938704 is 9052.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 46512400 + 35426304 = 6820^2 + 5952^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1122412 + ... + 1122484.

Almost surely, 2^81938704 is an apocalyptic number.

81938704 is the 9052-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81938704

81938704 is an abundant number, since it is smaller than the sum of its proper divisors (84381845).

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

81938704 is an equidigital number, since it uses as much as digits as its factorization.

81938704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The cubic root of 81938704 is about 434.3398698294.

The spelling of 81938704 in words is "eighty-one million, nine hundred thirty-eight thousand, seven hundred four".