81013604 has 24 divisors (see below), whose sum is σ = 162227520. Its totient is φ = 34677216.

The previous prime is 81013601. The next prime is 81013607. The reversal of 81013604 is 40631018.

It is an interprime number because it is at equal distance from previous prime (81013601) and next prime (81013607).

It is a self number, because there is not a number n which added to its sum of digits gives 81013604.

It is not an unprimeable number, because it can be changed into a prime (81013601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33467 + ... + 35805.

It is an arithmetic number, because the mean of its divisors is an integer number (6759480).

Almost surely, 2^81013604 is an apocalyptic number.

It is an amenable number.

81013604 is an abundant number, since it is smaller than the sum of its proper divisors (81213916).

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

81013604 is a wasteful number, since it uses less digits than its factorization.

81013604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3587 (or 3585 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 81013604 is about 9000.7557460471. The cubic root of 81013604 is about 432.6990924068.

The spelling of 81013604 in words is "eighty-one million, thirteen thousand, six hundred four".