81073624 has 16 divisors (see below), whose sum is σ = 152337600. Its totient is φ = 40450272.

The previous prime is 81073613. The next prime is 81073661. The reversal of 81073624 is 42637018.

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, 6747 + ... + 14410.

It is an arithmetic number, because the mean of its divisors is an integer number (9521100).

Almost surely, 2^81073624 is an apocalyptic number.

It is an amenable number.

81073624 is a deficient number, since it is larger than the sum of its proper divisors (71263976).

81073624 is a wasteful number, since it uses less digits than its factorization.

81073624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21642 (or 21638 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 81073624 is about 9004.0892932045. The cubic root of 81073624 is about 432.8059229774.

The spelling of 81073624 in words is "eighty-one million, seventy-three thousand, six hundred twenty-four".