215871728 has 10 divisors (see below), whose sum is σ = 418251504. Its totient is φ = 107935856.

The previous prime is 215871713. The next prime is 215871743. The reversal of 215871728 is 827178512.

It is an interprime number because it is at equal distance from previous prime (215871713) and next prime (215871743).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6745976 + ... + 6746007.

Almost surely, 2^215871728 is an apocalyptic number.

It is an amenable number.

215871728 is a deficient number, since it is larger than the sum of its proper divisors (202379776).

215871728 is a wasteful number, since it uses less digits than its factorization.

215871728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13491991 (or 13491985 counting only the distinct ones).

The product of its digits is 62720, while the sum is 41.

The square root of 215871728 is about 14692.5739065693. The cubic root of 215871728 is about 599.8812061112.

The spelling of 215871728 in words is "two hundred fifteen million, eight hundred seventy-one thousand, seven hundred twenty-eight".