81752408 has 16 divisors (see below), whose sum is σ = 155386680. Its totient is φ = 40315968.

The previous prime is 81752399. The next prime is 81752413. The reversal of 81752408 is 80425718.

It is a congruent number.

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, 69410 + ... + 70577.

Almost surely, 2^81752408 is an apocalyptic number.

It is an amenable number.

81752408 is a deficient number, since it is larger than the sum of its proper divisors (73634272).

81752408 is a wasteful number, since it uses less digits than its factorization.

81752408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140066 (or 140062 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 81752408 is about 9041.7038217363. The cubic root of 81752408 is about 434.0104480485.

The spelling of 81752408 in words is "eighty-one million, seven hundred fifty-two thousand, four hundred eight".