64117923 has 4 divisors (see below), whose sum is σ = 85490568. Its totient is φ = 42745280.

The previous prime is 64117903. The next prime is 64117981. The reversal of 64117923 is 32971146.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64117923 - 2⁸ = 64117667 is a prime.

It is a super-2 number, since 2×64117923² = 8222216099667858, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64117903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10686318 + ... + 10686323.

It is an arithmetic number, because the mean of its divisors is an integer number (21372642).

Almost surely, 2^64117923 is an apocalyptic number.

64117923 is a deficient number, since it is larger than the sum of its proper divisors (21372645).

64117923 is a wasteful number, since it uses less digits than its factorization.

64117923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21372644.

The product of its digits is 9072, while the sum is 33.

The square root of 64117923 is about 8007.3667956451. The cubic root of 64117923 is about 400.2455221830.

The spelling of 64117923 in words is "sixty-four million, one hundred seventeen thousand, nine hundred twenty-three".