81456875 has 30 divisors (see below), whose sum is σ = 105763020. Its totient is φ = 62698000.

The previous prime is 81456863. The next prime is 81456883. The reversal of 81456875 is 57865418.

It is a happy number.

It is not a de Polignac number, because 81456875 - 2⁶ = 81456811 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1380596 + ... + 1380654.

It is an arithmetic number, because the mean of its divisors is an integer number (3525434).

Almost surely, 2^81456875 is an apocalyptic number.

81456875 is a deficient number, since it is larger than the sum of its proper divisors (24306145).

81456875 is an frugal number, since it uses more digits than its factorization.

81456875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 111 counting only the distinct ones).

The product of its digits is 268800, while the sum is 44.

The square root of 81456875 is about 9025.3462537456. The cubic root of 81456875 is about 433.4868374637.

The spelling of 81456875 in words is "eighty-one million, four hundred fifty-six thousand, eight hundred seventy-five".