81057074 has 32 divisors (see below), whose sum is σ = 142819200. Its totient is φ = 34487376.

The previous prime is 81057073. The next prime is 81057103. The reversal of 81057074 is 47075018.

It is a self number, because there is not a number n which added to its sum of digits gives 81057074.

It is not an unprimeable number, because it can be changed into a prime (81057073) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 118337 + ... + 119019.

It is an arithmetic number, because the mean of its divisors is an integer number (4463100).

Almost surely, 2^81057074 is an apocalyptic number.

81057074 is a deficient number, since it is larger than the sum of its proper divisors (61762126).

81057074 is a wasteful number, since it uses less digits than its factorization.

81057074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879 (or 865 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 81057074 is about 9003.1702194283. The cubic root of 81057074 is about 432.7764706305.

The spelling of 81057074 in words is "eighty-one million, fifty-seven thousand, seventy-four".