64664215 has 24 divisors (see below), whose sum is σ = 97483680. Its totient is φ = 40307520.

The previous prime is 64664213. The next prime is 64664251. The reversal of 64664215 is 51246646.

It is not a de Polignac number, because 64664215 - 2¹ = 64664213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64664213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3400 + ... + 11869.

It is an arithmetic number, because the mean of its divisors is an integer number (4061820).

Almost surely, 2^64664215 is an apocalyptic number.

64664215 is a deficient number, since it is larger than the sum of its proper divisors (32819465).

64664215 is a wasteful number, since it uses less digits than its factorization.

64664215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15303 (or 15292 counting only the distinct ones).

The product of its digits is 34560, while the sum is 34.

The square root of 64664215 is about 8041.4062824857. The cubic root of 64664215 is about 401.3790215355.

Subtracting from 64664215 its reverse (51246646), we obtain a square (13417569 = 3663²).

The spelling of 64664215 in words is "sixty-four million, six hundred sixty-four thousand, two hundred fifteen".