215042657 has 8 divisors (see below), whose sum is σ = 217152672. Its totient is φ = 212940000.

The previous prime is 215042651. The next prime is 215042687. The reversal of 215042657 is 756240512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215042657 - 2¹⁸ = 214780513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215042651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70157 + ... + 73157.

It is an arithmetic number, because the mean of its divisors is an integer number (27144084).

Almost surely, 2^215042657 is an apocalyptic number.

It is an amenable number.

215042657 is a deficient number, since it is larger than the sum of its proper divisors (2110015).

215042657 is a wasteful number, since it uses less digits than its factorization.

215042657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3679.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 215042657 is about 14664.3328180998. The cubic root of 215042657 is about 599.1122584690.

The spelling of 215042657 in words is "two hundred fifteen million, forty-two thousand, six hundred fifty-seven".