215238456 has 96 divisors (see below), whose sum is σ = 610446720. Its totient is φ = 68428800.

The previous prime is 215238437. The next prime is 215238461. The reversal of 215238456 is 654832512.

215238456 is a `hidden beast` number, since 2 + 1 + 523 + 84 + 56 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 215238456.

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 23 ways as a sum of consecutive naturals, for example, 162276 + ... + 163596.

It is an arithmetic number, because the mean of its divisors is an integer number (6358820).

Almost surely, 2^215238456 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 215238456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305223360).

215238456 is an abundant number, since it is smaller than the sum of its proper divisors (395208264).

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

215238456 is a wasteful number, since it uses less digits than its factorization.

215238456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437 (or 1430 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 215238456 is about 14671.0073273787. The cubic root of 215238456 is about 599.2940363513.

The spelling of 215238456 in words is "two hundred fifteen million, two hundred thirty-eight thousand, four hundred fifty-six".