81627873 has 4 divisors (see below), whose sum is σ = 108837168. Its totient is φ = 54418580.

The previous prime is 81627787. The next prime is 81627881. The reversal of 81627873 is 37872618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81627873 - 2⁸ = 81627617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81627893) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13604643 + ... + 13604648.

It is an arithmetic number, because the mean of its divisors is an integer number (27209292).

Almost surely, 2^81627873 is an apocalyptic number.

It is an amenable number.

81627873 is a deficient number, since it is larger than the sum of its proper divisors (27209295).

81627873 is a wasteful number, since it uses less digits than its factorization.

81627873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27209294.

The product of its digits is 112896, while the sum is 42.

The square root of 81627873 is about 9034.8144972656. The cubic root of 81627873 is about 433.7899572577.

The spelling of 81627873 in words is "eighty-one million, six hundred twenty-seven thousand, eight hundred seventy-three".