64839923 has 2 divisors, whose sum is σ = 64839924. Its totient is φ = 64839922.

The previous prime is 64839919. The next prime is 64839949. The reversal of 64839923 is 32993846.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64839923 - 2² = 64839919 is a prime.

It is a super-2 number, since 2×64839923² = 8408431229291858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64839623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32419961 + 32419962.

It is an arithmetic number, because the mean of its divisors is an integer number (32419962).

Almost surely, 2^64839923 is an apocalyptic number.

64839923 is a deficient number, since it is larger than the sum of its proper divisors (1).

64839923 is an equidigital number, since it uses as much as digits as its factorization.

64839923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 44.

The square root of 64839923 is about 8052.3240744520. The cubic root of 64839923 is about 401.7422400647.

The spelling of 64839923 in words is "sixty-four million, eight hundred thirty-nine thousand, nine hundred twenty-three".