64015625 has 28 divisors (see below), whose sum is σ = 85077036. Its totient is φ = 48000000.

The previous prime is 64015621. The next prime is 64015631. The reversal of 64015625 is 52651046.

It can be written as a sum of positive squares in 14 ways, for example, as 62663056 + 1352569 = 7916^2 + 1163^2 .

It is a sliding number, since 64015625 = 15625 + 64000000 and 1/15625 + 1/64000000 = 0.000064015625.

It is not a de Polignac number, because 64015625 - 2² = 64015621 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64015621) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 265505 + ... + 265745.

Almost surely, 2^64015625 is an apocalyptic number.

It is an amenable number.

64015625 is a deficient number, since it is larger than the sum of its proper divisors (21061411).

64015625 is an frugal number, since it uses more digits than its factorization.

64015625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 64015625 is about 8000.9765029026. The cubic root of 64015625 is about 400.0325494346.

It can be divided in two parts, 640 and 15625, that multiplied together give a 7-th power (10000000 = 10⁷).

The spelling of 64015625 in words is "sixty-four million, fifteen thousand, six hundred twenty-five".