64908665 has 4 divisors (see below), whose sum is σ = 77890404. Its totient is φ = 51926928.

The previous prime is 64908659. The next prime is 64908671. The reversal of 64908665 is 56680946.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (64908659) and next prime (64908671).

It can be written as a sum of positive squares in 2 ways, for example, as 18627856 + 46280809 = 4316^2 + 6803^2 .

It is a cyclic number.

It is not a de Polignac number, because 64908665 - 2¹² = 64904569 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6490862 + ... + 6490871.

It is an arithmetic number, because the mean of its divisors is an integer number (19472601).

Almost surely, 2^64908665 is an apocalyptic number.

It is an amenable number.

64908665 is a deficient number, since it is larger than the sum of its proper divisors (12981739).

64908665 is a wasteful number, since it uses less digits than its factorization.

64908665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12981738.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 64908665 is about 8056.5914008345. The cubic root of 64908665 is about 401.8841629728.

The spelling of 64908665 in words is "sixty-four million, nine hundred eight thousand, six hundred sixty-five".