81255976 has 24 divisors (see below), whose sum is σ = 153694170. Its totient is φ = 40273568.

The previous prime is 81255961. The next prime is 81255983. The reversal of 81255976 is 67955218.

It can be written as a sum of positive squares in only one way, i.e., 80102500 + 1153476 = 8950^2 + 1074^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 256170 + ... + 256486.

Almost surely, 2^81255976 is an apocalyptic number.

It is an amenable number.

81255976 is a deficient number, since it is larger than the sum of its proper divisors (72438194).

81255976 is a wasteful number, since it uses less digits than its factorization.

81255976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681 (or 498 counting only the distinct ones).

The product of its digits is 151200, while the sum is 43.

The square root of 81255976 is about 9014.2096714021. The cubic root of 81255976 is about 433.1301711689.

The spelling of 81255976 in words is "eighty-one million, two hundred fifty-five thousand, nine hundred seventy-six".