15220664 has 16 divisors (see below), whose sum is σ = 29779920. Its totient is φ = 7279360.

The previous prime is 15220663. The next prime is 15220669. The reversal of 15220664 is 46602251.

15220664 is nontrivially palindromic in base 11.

It is a super-2 number, since 2×15220664² = 463337225201792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15220663) 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, 41177 + ... + 41544.

It is an arithmetic number, because the mean of its divisors is an integer number (1861245).

Almost surely, 2^15220664 is an apocalyptic number.

It is an amenable number.

15220664 is a deficient number, since it is larger than the sum of its proper divisors (14559256).

15220664 is a wasteful number, since it uses less digits than its factorization.

15220664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82750 (or 82746 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 15220664 is about 3901.3669399327. The cubic root of 15220664 is about 247.8246679557.

The spelling of 15220664 in words is "fifteen million, two hundred twenty thousand, six hundred sixty-four".