81672595 has 16 divisors (see below), whose sum is σ = 100038240. Its totient is φ = 63993600.

The previous prime is 81672587. The next prime is 81672599. The reversal of 81672595 is 59527618.

It is not a de Polignac number, because 81672595 - 2³ = 81672587 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81672599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100551 + ... + 101359.

It is an arithmetic number, because the mean of its divisors is an integer number (6252390).

Almost surely, 2^81672595 is an apocalyptic number.

81672595 is a deficient number, since it is larger than the sum of its proper divisors (18365645).

81672595 is a wasteful number, since it uses less digits than its factorization.

81672595 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1206.

The product of its digits is 151200, while the sum is 43.

The square root of 81672595 is about 9037.2891400021. The cubic root of 81672595 is about 433.8691639139.

The spelling of 81672595 in words is "eighty-one million, six hundred seventy-two thousand, five hundred ninety-five".