215730944 has 144 divisors (see below), whose sum is σ = 519208704. Its totient is φ = 88166400.

The previous prime is 215730877. The next prime is 215730967. The reversal of 215730944 is 449037512.

It is a super-2 number, since 2×215730944² = 93079680398262272, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 2599127 + ... + 2599209.

It is an arithmetic number, because the mean of its divisors is an integer number (3605616).

Almost surely, 2^215730944 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 215730944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259604352).

215730944 is an abundant number, since it is smaller than the sum of its proper divisors (303477760).

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

215730944 is a wasteful number, since it uses less digits than its factorization.

215730944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 215730944 is about 14687.7821334604. The cubic root of 215730944 is about 599.7507705629.

The spelling of 215730944 in words is "two hundred fifteen million, seven hundred thirty thousand, nine hundred forty-four".