81016604 has 12 divisors (see below), whose sum is σ = 146668200. Its totient is φ = 39111408.

The previous prime is 81016597. The next prime is 81016619. The reversal of 81016604 is 40661018.

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, 349094 + ... + 349325.

It is an arithmetic number, because the mean of its divisors is an integer number (12222350).

Almost surely, 2^81016604 is an apocalyptic number.

It is an amenable number.

81016604 is a deficient number, since it is larger than the sum of its proper divisors (65651596).

81016604 is a wasteful number, since it uses less digits than its factorization.

81016604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698452 (or 698450 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 81016604 is about 9000.9223971769. The cubic root of 81016604 is about 432.7044334080.

The spelling of 81016604 in words is "eighty-one million, sixteen thousand, six hundred four".