15861228 has 12 divisors (see below), whose sum is σ = 37009560. Its totient is φ = 5287072.

The previous prime is 15861203. The next prime is 15861233. The reversal of 15861228 is 82216851.

15861228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

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, 660873 + ... + 660896.

It is an arithmetic number, because the mean of its divisors is an integer number (3084130).

Almost surely, 2^15861228 is an apocalyptic number.

It is an amenable number.

15861228 is an abundant number, since it is smaller than the sum of its proper divisors (21148332).

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

15861228 is a wasteful number, since it uses less digits than its factorization.

15861228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321776 (or 1321774 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 15861228 is about 3982.6157233657. The cubic root of 15861228 is about 251.2535862462.

The spelling of 15861228 in words is "fifteen million, eight hundred sixty-one thousand, two hundred twenty-eight".