81790256 has 10 divisors (see below), whose sum is σ = 158468652. Its totient is φ = 40895120.

The previous prime is 81790229. The next prime is 81790271. The reversal of 81790256 is 65209718.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2555930 + ... + 2555961.

Almost surely, 2^81790256 is an apocalyptic number.

It is an amenable number.

81790256 is a deficient number, since it is larger than the sum of its proper divisors (76678396).

81790256 is a wasteful number, since it uses less digits than its factorization.

81790256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5111899 (or 5111893 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 81790256 is about 9043.7965479106. The cubic root of 81790256 is about 434.0774140400.

The spelling of 81790256 in words is "eighty-one million, seven hundred ninety thousand, two hundred fifty-six".