81374256 has 60 divisors (see below), whose sum is σ = 235094080. Its totient is φ = 26248320.

The previous prime is 81374243. The next prime is 81374269. The reversal of 81374256 is 65247318.

It is an interprime number because it is at equal distance from previous prime (81374243) and next prime (81374269).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81374256.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4651 + ... + 13578.

Almost surely, 2^81374256 is an apocalyptic number.

It is an amenable number.

81374256 is an abundant number, since it is smaller than the sum of its proper divisors (153719824).

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

81374256 is a wasteful number, since it uses less digits than its factorization.

81374256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18274 (or 18265 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 81374256 is about 9020.7680382548. The cubic root of 81374256 is about 433.3402307909.

The spelling of 81374256 in words is "eighty-one million, three hundred seventy-four thousand, two hundred fifty-six".