64465631 has 4 divisors (see below), whose sum is σ = 64482000. Its totient is φ = 64449264.

The previous prime is 64465627. The next prime is 64465633. The reversal of 64465631 is 13656446.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 64465631 - 2² = 64465627 is a prime.

It is a super-2 number, since 2×64465631² = 8311635160456322, 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 = 64465591 and 64465600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64465633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1715 + ... + 11483.

It is an arithmetic number, because the mean of its divisors is an integer number (16120500).

Almost surely, 2^64465631 is an apocalyptic number.

64465631 is a deficient number, since it is larger than the sum of its proper divisors (16369).

64465631 is an equidigital number, since it uses as much as digits as its factorization.

64465631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16368.

The product of its digits is 51840, while the sum is 35.

The square root of 64465631 is about 8029.0491965114. The cubic root of 64465631 is about 400.9677214831.

The spelling of 64465631 in words is "sixty-four million, four hundred sixty-five thousand, six hundred thirty-one".