64378923 has 8 divisors (see below), whose sum is σ = 98101248. Its totient is φ = 36787944.

The previous prime is 64378913. The next prime is 64378939. The reversal of 64378923 is 32987346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64378923 - 2⁴ = 64378907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64378913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1532811 + ... + 1532852.

It is an arithmetic number, because the mean of its divisors is an integer number (12262656).

Almost surely, 2^64378923 is an apocalyptic number.

64378923 is a deficient number, since it is larger than the sum of its proper divisors (33722325).

64378923 is a wasteful number, since it uses less digits than its factorization.

64378923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3065673.

The product of its digits is 217728, while the sum is 42.

The square root of 64378923 is about 8023.6477365348. The cubic root of 64378923 is about 400.7878700497.

The spelling of 64378923 in words is "sixty-four million, three hundred seventy-eight thousand, nine hundred twenty-three".