64015994 has 16 divisors (see below), whose sum is σ = 112708608. Its totient is φ = 26693712.

The previous prime is 64015993. The next prime is 64016011. The reversal of 64015994 is 49951046.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64015993) 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, 61274 + ... + 62309.

It is an arithmetic number, because the mean of its divisors is an integer number (7044288).

Almost surely, 2^64015994 is an apocalyptic number.

64015994 is a deficient number, since it is larger than the sum of its proper divisors (48692614).

64015994 is a wasteful number, since it uses less digits than its factorization.

64015994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123629.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 64015994 is about 8000.9995625547. Note that the first 3 decimals coincide. The cubic root of 64015994 is about 400.0333180580.

The spelling of 64015994 in words is "sixty-four million, fifteen thousand, nine hundred ninety-four".