81255474 has 20 divisors (see below), whose sum is σ = 182072814. Its totient is φ = 27085104.

The previous prime is 81255469. The next prime is 81255491. The reversal of 81255474 is 47455218.

It can be written as a sum of positive squares in only one way, i.e., 55398249 + 25857225 = 7443^2 + 5085^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 250627 + ... + 250950.

Almost surely, 2^81255474 is an apocalyptic number.

81255474 is an abundant number, since it is smaller than the sum of its proper divisors (100817340).

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

81255474 is a wasteful number, since it uses less digits than its factorization.

81255474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501591 (or 501582 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 81255474 is about 9014.1818264333. The cubic root of 81255474 is about 433.1292792066.

The spelling of 81255474 in words is "eighty-one million, two hundred fifty-five thousand, four hundred seventy-four".