215772928 has 54 divisors (see below), whose sum is σ = 493654616. Its totient is φ = 92207616.

The previous prime is 215772923. The next prime is 215772961. The reversal of 215772928 is 829277512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215772923) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 621651 + ... + 621997.

Almost surely, 2^215772928 is an apocalyptic number.

215772928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215772928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246827308).

215772928 is an abundant number, since it is smaller than the sum of its proper divisors (277881688).

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

215772928 is an frugal number, since it uses more digits than its factorization.

215772928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717 (or 356 counting only the distinct ones).

The product of its digits is 141120, while the sum is 43.

The square root of 215772928 is about 14689.2112790306. The cubic root of 215772928 is about 599.7896744287.

The spelling of 215772928 in words is "two hundred fifteen million, seven hundred seventy-two thousand, nine hundred twenty-eight".