86644025 has 36 divisors (see below), whose sum is σ = 120208452. Its totient is φ = 61582080.

The previous prime is 86644021. The next prime is 86644031. The reversal of 86644025 is 52044668.

It can be written as a sum of positive squares in 18 ways, for example, as 83247376 + 3396649 = 9124^2 + 1843^2 .

It is not a de Polignac number, because 86644025 - 2² = 86644021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86644021) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 273167 + ... + 273483.

Almost surely, 2^86644025 is an apocalyptic number.

It is an amenable number.

86644025 is a deficient number, since it is larger than the sum of its proper divisors (33564427).

86644025 is a wasteful number, since it uses less digits than its factorization.

86644025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398 (or 364 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 86644025 is about 9308.2772305083. The cubic root of 86644025 is about 442.4995903685.

The spelling of 86644025 in words is "eighty-six million, six hundred forty-four thousand, twenty-five".