64939917 has 16 divisors (see below), whose sum is σ = 99184640. Its totient is φ = 37022832.

The previous prime is 64939877. The next prime is 64939957. The reversal of 64939917 is 71993946.

It is an interprime number because it is at equal distance from previous prime (64939877) and next prime (64939957).

It is not a de Polignac number, because 64939917 - 2⁸ = 64939661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64939957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6384 + ... + 13062.

It is an arithmetic number, because the mean of its divisors is an integer number (6199040).

Almost surely, 2^64939917 is an apocalyptic number.

It is an amenable number.

64939917 is a deficient number, since it is larger than the sum of its proper divisors (34244723).

64939917 is a wasteful number, since it uses less digits than its factorization.

64939917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7152.

The product of its digits is 367416, while the sum is 48.

The square root of 64939917 is about 8058.5306973418. The cubic root of 64939917 is about 401.9486518906.

It can be divided in two parts, 64939 and 917, that added together give a palindrome (65856).

The spelling of 64939917 in words is "sixty-four million, nine hundred thirty-nine thousand, nine hundred seventeen".