64664767 has 8 divisors (see below), whose sum is σ = 65886480. Its totient is φ = 63447360.

The previous prime is 64664737. The next prime is 64664773. The reversal of 64664767 is 76746646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64664767 - 2¹⁵ = 64631999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64664737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60417 + ... + 61477.

It is an arithmetic number, because the mean of its divisors is an integer number (8235810).

Almost surely, 2^64664767 is an apocalyptic number.

64664767 is a deficient number, since it is larger than the sum of its proper divisors (1221713).

64664767 is a wasteful number, since it uses less digits than its factorization.

64664767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2153.

The product of its digits is 1016064, while the sum is 46.

The square root of 64664767 is about 8041.4406047673. The cubic root of 64664767 is about 401.3801636437.

The spelling of 64664767 in words is "sixty-four million, six hundred sixty-four thousand, seven hundred sixty-seven".