64671625 has 8 divisors (see below), whose sum is σ = 80710344. Its totient is φ = 51737200.

The previous prime is 64671589. The next prime is 64671631. The reversal of 64671625 is 52617646.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 927369 + 63744256 = 963^2 + 7984^2 .

It is not a de Polignac number, because 64671625 - 2¹⁵ = 64638857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258562 + ... + 258811.

It is an arithmetic number, because the mean of its divisors is an integer number (10088793).

Almost surely, 2^64671625 is an apocalyptic number.

It is an amenable number.

64671625 is a deficient number, since it is larger than the sum of its proper divisors (16038719).

64671625 is an equidigital number, since it uses as much as digits as its factorization.

64671625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517388 (or 517378 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The square root of 64671625 is about 8041.8670095942. The cubic root of 64671625 is about 401.3943525546.

The spelling of 64671625 in words is "sixty-four million, six hundred seventy-one thousand, six hundred twenty-five".