315221868 has 120 divisors (see below), whose sum is σ = 901492592. Its totient is φ = 95458176.

The previous prime is 315221861. The next prime is 315221887. The reversal of 315221868 is 868122513.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (315221861) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 281646 + ... + 282762.

Almost surely, 2^315221868 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 315221868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (450746296).

315221868 is an abundant number, since it is smaller than the sum of its proper divisors (586270724).

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

315221868 is a wasteful number, since it uses less digits than its factorization.

315221868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213 (or 1202 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 315221868 is about 17754.4886718824. The cubic root of 315221868 is about 680.5689212271.

The spelling of 315221868 in words is "three hundred fifteen million, two hundred twenty-one thousand, eight hundred sixty-eight".