15218868 has 48 divisors (see below), whose sum is σ = 41000960. Its totient is φ = 4303584.

The previous prime is 15218857. The next prime is 15218887. The reversal of 15218868 is 86881251.

It is a super-2 number, since 2×15218868² = 463227886402848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7773 + ... + 9531.

Almost surely, 2^15218868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15218868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20500480).

15218868 is an abundant number, since it is smaller than the sum of its proper divisors (25782092).

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

15218868 is a wasteful number, since it uses less digits than its factorization.

15218868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876 (or 1874 counting only the distinct ones).

The product of its digits is 30720, while the sum is 39.

The square root of 15218868 is about 3901.1367574080. The cubic root of 15218868 is about 247.8149200102.

The spelling of 15218868 in words is "fifteen million, two hundred eighteen thousand, eight hundred sixty-eight".