64624189 has 6 divisors (see below), whose sum is σ = 75175134. Its totient is φ = 55392120.

The previous prime is 64624177. The next prime is 64624223. The reversal of 64624189 is 98142646.

It can be written as a sum of positive squares in only one way, i.e., 41024025 + 23600164 = 6405^2 + 4858^2 .

It is not a de Polignac number, because 64624189 - 2⁷ = 64624061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64624139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 659382 + ... + 659479.

It is an arithmetic number, because the mean of its divisors is an integer number (12529189).

Almost surely, 2^64624189 is an apocalyptic number.

It is an amenable number.

64624189 is a deficient number, since it is larger than the sum of its proper divisors (10550945).

64624189 is a wasteful number, since it uses less digits than its factorization.

64624189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318875 (or 1318868 counting only the distinct ones).

The product of its digits is 82944, while the sum is 40.

The square root of 64624189 is about 8038.9171534480. The cubic root of 64624189 is about 401.2961889486.

The spelling of 64624189 in words is "sixty-four million, six hundred twenty-four thousand, one hundred eighty-nine".