81140876 has 12 divisors (see below), whose sum is σ = 143081400. Its totient is φ = 40260480.

The previous prime is 81140837. The next prime is 81140903. The reversal of 81140876 is 67804118.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76901 + ... + 77948.

It is an arithmetic number, because the mean of its divisors is an integer number (11923450).

Almost surely, 2^81140876 is an apocalyptic number.

It is an amenable number.

81140876 is a deficient number, since it is larger than the sum of its proper divisors (61940524).

81140876 is a wasteful number, since it uses less digits than its factorization.

81140876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154984 (or 154982 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 81140876 is about 9007.8230444431. The cubic root of 81140876 is about 432.9255632826.

The spelling of 81140876 in words is "eighty-one million, one hundred forty thousand, eight hundred seventy-six".