64466721 has 12 divisors (see below), whose sum is σ = 101584080. Its totient is φ = 39070680.

The previous prime is 64466713. The next prime is 64466729. The reversal of 64466721 is 12766446.

64466721 is a `hidden beast` number, since 644 + 6 + 6 + 7 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (64466713) and next prime (64466729).

It is not a de Polignac number, because 64466721 - 2³ = 64466713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64466729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325491 + ... + 325688.

It is an arithmetic number, because the mean of its divisors is an integer number (8465340).

Almost surely, 2^64466721 is an apocalyptic number.

It is an amenable number.

64466721 is a deficient number, since it is larger than the sum of its proper divisors (37117359).

64466721 is a wasteful number, since it uses less digits than its factorization.

64466721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651196 (or 651193 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 64466721 is about 8029.1170747474. The cubic root of 64466721 is about 400.9699813558.

The spelling of 64466721 in words is "sixty-four million, four hundred sixty-six thousand, seven hundred twenty-one".