215471664 has 50 divisors (see below), whose sum is σ = 623641260. Its totient is φ = 71823456.

The previous prime is 215471657. The next prime is 215471671. The reversal of 215471664 is 466174512.

It is an interprime number because it is at equal distance from previous prime (215471657) and next prime (215471671).

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

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 81834 + ... + 84425.

Almost surely, 2^215471664 is an apocalyptic number.

215471664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

215471664 is an abundant number, since it is smaller than the sum of its proper divisors (408169596).

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

215471664 is a wasteful number, since it uses less digits than its factorization.

215471664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166279 (or 166264 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 215471664 is about 14678.9530961850. The cubic root of 215471664 is about 599.5104005960.

The spelling of 215471664 in words is "two hundred fifteen million, four hundred seventy-one thousand, six hundred sixty-four".