15664494 has 16 divisors (see below), whose sum is σ = 31640400. Its totient is φ = 5169600.

The previous prime is 15664487. The next prime is 15664529. The reversal of 15664494 is 49446651.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12319 + ... + 13530.

It is an arithmetic number, because the mean of its divisors is an integer number (1977525).

Almost surely, 2^15664494 is an apocalyptic number.

15664494 is an abundant number, since it is smaller than the sum of its proper divisors (15975906).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15664494 is a wasteful number, since it uses less digits than its factorization.

15664494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25955.

The product of its digits is 103680, while the sum is 39.

The square root of 15664494 is about 3957.8395621854. The cubic root of 15664494 is about 250.2104574476.

The spelling of 15664494 in words is "fifteen million, six hundred sixty-four thousand, four hundred ninety-four".