82561974 has 16 divisors (see below), whose sum is σ = 180135360. Its totient is φ = 25018760.

The previous prime is 82561951. The next prime is 82561991. The reversal of 82561974 is 47916528.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 625404 + ... + 625535.

It is an arithmetic number, because the mean of its divisors is an integer number (11258460).

Almost surely, 2^82561974 is an apocalyptic number.

82561974 is an abundant number, since it is smaller than the sum of its proper divisors (97573386).

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

82561974 is a wasteful number, since it uses less digits than its factorization.

82561974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250955.

The product of its digits is 120960, while the sum is 42.

The square root of 82561974 is about 9086.3619782617. The cubic root of 82561974 is about 435.4383637527.

The spelling of 82561974 in words is "eighty-two million, five hundred sixty-one thousand, nine hundred seventy-four".