81876974 has 16 divisors (see below), whose sum is σ = 124623360. Its totient is φ = 40339200.

The previous prime is 81876931. The next prime is 81876989. The reversal of 81876974 is 47967818.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67574 + ... + 68774.

It is an arithmetic number, because the mean of its divisors is an integer number (7788960).

Almost surely, 2^81876974 is an apocalyptic number.

81876974 is a deficient number, since it is larger than the sum of its proper divisors (42746386).

81876974 is a wasteful number, since it uses less digits than its factorization.

81876974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675.

The product of its digits is 677376, while the sum is 50.

The square root of 81876974 is about 9048.5896138570. The cubic root of 81876974 is about 434.2307698367.

The spelling of 81876974 in words is "eighty-one million, eight hundred seventy-six thousand, nine hundred seventy-four".