82138825 has 12 divisors (see below), whose sum is σ = 102282268. Its totient is φ = 65433600.

The previous prime is 82138811. The next prime is 82138831. The reversal of 82138825 is 52883128.

It can be written as a sum of positive squares in 6 ways, for example, as 760384 + 81378441 = 872^2 + 9021^2 .

It is not a de Polignac number, because 82138825 - 2⁷ = 82138697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 792 + ... + 12841.

Almost surely, 2^82138825 is an apocalyptic number.

It is an amenable number.

82138825 is a deficient number, since it is larger than the sum of its proper divisors (20143443).

82138825 is a wasteful number, since it uses less digits than its factorization.

82138825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13884 (or 13879 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 82138825 is about 9063.0472248577. The cubic root of 82138825 is about 434.6931821550.

The spelling of 82138825 in words is "eighty-two million, one hundred thirty-eight thousand, eight hundred twenty-five".