64390023 has 12 divisors (see below), whose sum is σ = 93566928. Its totient is φ = 42668640.

The previous prime is 64390019. The next prime is 64390061. The reversal of 64390023 is 32009346.

It is not a de Polignac number, because 64390023 - 2² = 64390019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64390013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19918 + ... + 22923.

It is an arithmetic number, because the mean of its divisors is an integer number (7797244).

Almost surely, 2^64390023 is an apocalyptic number.

64390023 is a deficient number, since it is larger than the sum of its proper divisors (29176905).

64390023 is a wasteful number, since it uses less digits than its factorization.

64390023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43014 (or 43011 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 64390023 is about 8024.3394120638. The cubic root of 64390023 is about 400.8109028970.

Adding to 64390023 its reverse (32009346), we get a palindrome (96399369).

The spelling of 64390023 in words is "sixty-four million, three hundred ninety thousand, twenty-three".