215672728 has 8 divisors (see below), whose sum is σ = 404386380. Its totient is φ = 107836360.

The previous prime is 215672711. The next prime is 215672729. The reversal of 215672728 is 827276512.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215672729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13479538 + ... + 13479553.

Almost surely, 2^215672728 is an apocalyptic number.

It is an amenable number.

215672728 is a deficient number, since it is larger than the sum of its proper divisors (188713652).

215672728 is a wasteful number, since it uses less digits than its factorization.

215672728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26959097 (or 26959093 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 215672728 is about 14685.8002165357. The cubic root of 215672728 is about 599.6968171965.

The spelling of 215672728 in words is "two hundred fifteen million, six hundred seventy-two thousand, seven hundred twenty-eight".