81865274 has 16 divisors (see below), whose sum is σ = 126475776. Its totient is φ = 39717600.

The previous prime is 81865261. The next prime is 81865291. The reversal of 81865274 is 47256818.

It is a Harshad number since it is a multiple of its sum of digits (41).

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, 13049 + ... + 18275.

It is an arithmetic number, because the mean of its divisors is an integer number (7904736).

Almost surely, 2^81865274 is an apocalyptic number.

81865274 is a deficient number, since it is larger than the sum of its proper divisors (44610502).

81865274 is a wasteful number, since it uses less digits than its factorization.

81865274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5461.

The product of its digits is 107520, while the sum is 41.

The square root of 81865274 is about 9047.9430811649. The cubic root of 81865274 is about 434.2100853806.

The spelling of 81865274 in words is "eighty-one million, eight hundred sixty-five thousand, two hundred seventy-four".