64389994 has 8 divisors (see below), whose sum is σ = 96642180. Its totient is φ = 32175936.

The previous prime is 64389959. The next prime is 64390009. The reversal of 64389994 is 49998346.

It can be written as a sum of positive squares in 2 ways, for example, as 64240225 + 149769 = 8015^2 + 387^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4849 + ... + 12340.

Almost surely, 2^64389994 is an apocalyptic number.

64389994 is a deficient number, since it is larger than the sum of its proper divisors (32252186).

64389994 is a wasteful number, since it uses less digits than its factorization.

64389994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19064.

The product of its digits is 1679616, while the sum is 52.

The square root of 64389994 is about 8024.3376050612. The cubic root of 64389994 is about 400.8108427246.

The spelling of 64389994 in words is "sixty-four million, three hundred eighty-nine thousand, nine hundred ninety-four".