64631995 has 8 divisors (see below), whose sum is σ = 77606784. Its totient is φ = 51673344.

The previous prime is 64631989. The next prime is 64631999. The reversal of 64631995 is 59913646.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64631995 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64631999) 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, 8107 + ... + 13963.

It is an arithmetic number, because the mean of its divisors is an integer number (9700848).

Almost surely, 2^64631995 is an apocalyptic number.

64631995 is a deficient number, since it is larger than the sum of its proper divisors (12974789).

64631995 is a wasteful number, since it uses less digits than its factorization.

64631995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8069.

The product of its digits is 174960, while the sum is 43.

The square root of 64631995 is about 8039.4026519388. The cubic root of 64631995 is about 401.3123459118.

The spelling of 64631995 in words is "sixty-four million, six hundred thirty-one thousand, nine hundred ninety-five".