64923855 has 32 divisors (see below), whose sum is σ = 110419200. Its totient is φ = 32481792.

The previous prime is 64923853. The next prime is 64923857. The reversal of 64923855 is 55832946.

It is an interprime number because it is at equal distance from previous prime (64923853) and next prime (64923857).

It is not a de Polignac number, because 64923855 - 2¹ = 64923853 is a prime.

It is a super-2 number, since 2×64923855² = 8430213896122050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64923853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29431 + ... + 31559.

It is an arithmetic number, because the mean of its divisors is an integer number (3450600).

Almost surely, 2^64923855 is an apocalyptic number.

64923855 is a deficient number, since it is larger than the sum of its proper divisors (45495345).

64923855 is a wasteful number, since it uses less digits than its factorization.

64923855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2263.

The product of its digits is 259200, while the sum is 42.

The square root of 64923855 is about 8057.5340520534. The cubic root of 64923855 is about 401.9155103248.

Subtracting from 64923855 its reverse (55832946), we obtain a palindrome (9090909).

The spelling of 64923855 in words is "sixty-four million, nine hundred twenty-three thousand, eight hundred fifty-five".