215868027456 has 231 divisors, whose sum is σ = 645240753331. Its totient is φ = 71654937984.

The previous prime is 215868027383. The next prime is 215868027457. The reversal of 215868027456 is 654720868512.

The square root of 215868027456 is 464616.

It is a perfect power (a square), and thus also a powerful number.

215868027456 is a `hidden beast` number, since 2 + 1 + 586 + 8 + 0 + 2 + 7 + 4 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215868027457) by changing a digit.

It is a polite number, since it can be written in 32 ways as a sum of consecutive naturals, for example, 903213385 + ... + 903213623.

Almost surely, 2^215868027456 is an apocalyptic number.

215868027456 is the 464616-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215868027456

215868027456 is an abundant number, since it is smaller than the sum of its proper divisors (429372725875).

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

215868027456 is an frugal number, since it uses more digits than its factorization.

215868027456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 54.

The spelling of 215868027456 in words is "two hundred fifteen billion, eight hundred sixty-eight million, twenty-seven thousand, four hundred fifty-six".