64394923 has 4 divisors (see below), whose sum is σ = 64540728. Its totient is φ = 64249120.

The previous prime is 64394903. The next prime is 64394927. The reversal of 64394923 is 32949346.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64394923 is a prime.

It is a super-2 number, since 2×64394923² = 8293412216351858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64394927) 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, 72238 + ... + 73123.

It is an arithmetic number, because the mean of its divisors is an integer number (16135182).

Almost surely, 2^64394923 is an apocalyptic number.

64394923 is a deficient number, since it is larger than the sum of its proper divisors (145805).

64394923 is a wasteful number, since it uses less digits than its factorization.

64394923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145804.

The product of its digits is 139968, while the sum is 40.

The square root of 64394923 is about 8024.6447273384. The cubic root of 64394923 is about 400.8210697082.

The spelling of 64394923 in words is "sixty-four million, three hundred ninety-four thousand, nine hundred twenty-three".