215256616 has 16 divisors (see below), whose sum is σ = 412194240. Its totient is φ = 105338160.

The previous prime is 215256611. The next prime is 215256619. The reversal of 215256616 is 616652512.

It is not an unprimeable number, because it can be changed into a prime (215256611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285870 + ... + 286621.

It is an arithmetic number, because the mean of its divisors is an integer number (25762140).

Almost surely, 2^215256616 is an apocalyptic number.

It is an amenable number.

215256616 is a deficient number, since it is larger than the sum of its proper divisors (196937624).

215256616 is a wasteful number, since it uses less digits than its factorization.

215256616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572544 (or 572540 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 215256616 is about 14671.6262220655. The cubic root of 215256616 is about 599.3108903309.

The spelling of 215256616 in words is "two hundred fifteen million, two hundred fifty-six thousand, six hundred sixteen".