215987464 has 32 divisors (see below), whose sum is σ = 504907200. Its totient is φ = 84150720.

The previous prime is 215987449. The next prime is 215987479. The reversal of 215987464 is 464789512.

It is an interprime number because it is at equal distance from previous prime (215987449) and next prime (215987479).

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, 174699 + ... + 175930.

It is an arithmetic number, because the mean of its divisors is an integer number (15778350).

Almost surely, 2^215987464 is an apocalyptic number.

It is an amenable number.

215987464 is an abundant number, since it is smaller than the sum of its proper divisors (288919736).

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

215987464 is a wasteful number, since it uses less digits than its factorization.

215987464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350653 (or 350649 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The square root of 215987464 is about 14696.5119671302. The cubic root of 215987464 is about 599.9883923680.

The spelling of 215987464 in words is "two hundred fifteen million, nine hundred eighty-seven thousand, four hundred sixty-four".