81034664 has 16 divisors (see below), whose sum is σ = 152056320. Its totient is φ = 40486320.

The previous prime is 81034621. The next prime is 81034697. The reversal of 81034664 is 46643018.

It is a self number, because there is not a number n which added to its sum of digits gives 81034664.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10259 + ... + 16349.

It is an arithmetic number, because the mean of its divisors is an integer number (9503520).

Almost surely, 2^81034664 is an apocalyptic number.

It is an amenable number.

81034664 is a deficient number, since it is larger than the sum of its proper divisors (71021656).

81034664 is a wasteful number, since it uses less digits than its factorization.

81034664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7760 (or 7756 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 81034664 is about 9001.9255717874. The cubic root of 81034664 is about 432.7365834492.

The spelling of 81034664 in words is "eighty-one million, thirty-four thousand, six hundred sixty-four".