81016504 has 16 divisors (see below), whose sum is σ = 153382320. Its totient is φ = 40114560.

The previous prime is 81016493. The next prime is 81016531. The reversal of 81016504 is 40561018.

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, 48337 + ... + 49984.

It is an arithmetic number, because the mean of its divisors is an integer number (9586395).

Almost surely, 2^81016504 is an apocalyptic number.

It is an amenable number.

81016504 is a deficient number, since it is larger than the sum of its proper divisors (72365816).

81016504 is a wasteful number, since it uses less digits than its factorization.

81016504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98430 (or 98426 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 81016504 is about 9000.9168421889. The cubic root of 81016504 is about 432.7042553767.

The spelling of 81016504 in words is "eighty-one million, sixteen thousand, five hundred four".