64664131 has 8 divisors (see below), whose sum is σ = 75620864. Its totient is φ = 54137160.

The previous prime is 64664099. The next prime is 64664147. The reversal of 64664131 is 13146646.

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

It is not a de Polignac number, because 64664131 - 2⁵ = 64664099 is a prime.

It is a super-2 number, since 2×64664131² = 8362899675970322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64664093 and 64664102.

It is not an unprimeable number, because it can be changed into a prime (64664191) 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, 107115 + ... + 107716.

It is an arithmetic number, because the mean of its divisors is an integer number (9452608).

Almost surely, 2^64664131 is an apocalyptic number.

64664131 is a deficient number, since it is larger than the sum of its proper divisors (10956733).

64664131 is a wasteful number, since it uses less digits than its factorization.

64664131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214881.

The product of its digits is 10368, while the sum is 31.

The square root of 64664131 is about 8041.4010595169. The cubic root of 64664131 is about 401.3788477359.

The spelling of 64664131 in words is "sixty-four million, six hundred sixty-four thousand, one hundred thirty-one".