81740875 has 8 divisors (see below), whose sum is σ = 102012768. Its totient is φ = 65392600.

The previous prime is 81740861. The next prime is 81740891. The reversal of 81740875 is 57804718.

It is not a de Polignac number, because 81740875 - 2²⁵ = 48186443 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326839 + ... + 327088.

It is an arithmetic number, because the mean of its divisors is an integer number (12751596).

Almost surely, 2^81740875 is an apocalyptic number.

81740875 is a deficient number, since it is larger than the sum of its proper divisors (20271893).

81740875 is an equidigital number, since it uses as much as digits as its factorization.

81740875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653942 (or 653932 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 40.

The square root of 81740875 is about 9041.0660322774. The cubic root of 81740875 is about 433.9900381384.

The spelling of 81740875 in words is "eighty-one million, seven hundred forty thousand, eight hundred seventy-five".