215378816 has 32 divisors (see below), whose sum is σ = 438216480. Its totient is φ = 105395200.

The previous prime is 215378789. The next prime is 215378827. The reversal of 215378816 is 618873512.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11885 + ... + 23916.

It is an arithmetic number, because the mean of its divisors is an integer number (13694265).

Almost surely, 2^215378816 is an apocalyptic number.

It is an amenable number.

215378816 is an abundant number, since it is smaller than the sum of its proper divisors (222837664).

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

215378816 is an equidigital number, since it uses as much as digits as its factorization.

215378816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35862 (or 35850 counting only the distinct ones).

The product of its digits is 80640, while the sum is 41.

The square root of 215378816 is about 14675.7901320508. The cubic root of 215378816 is about 599.4242773788.

The spelling of 215378816 in words is "two hundred fifteen million, three hundred seventy-eight thousand, eight hundred sixteen".