28915617 has 8 divisors (see below), whose sum is σ = 38698560. Its totient is φ = 19204880.

The previous prime is 28915597. The next prime is 28915633. The reversal of 28915617 is 71651982.

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 28915617 - 2⁷ = 28915489 is a prime.

It is a super-2 number, since 2×28915617² = 1672225812981378, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28915637) 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, 17109 + ... + 18722.

It is an arithmetic number, because the mean of its divisors is an integer number (4837320).

Almost surely, 2^28915617 is an apocalyptic number.

It is an amenable number.

28915617 is a deficient number, since it is larger than the sum of its proper divisors (9782943).

28915617 is a wasteful number, since it uses less digits than its factorization.

28915617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36103.

The product of its digits is 30240, while the sum is 39.

The square root of 28915617 is about 5377.3243346482. The cubic root of 28915617 is about 306.9334030618.

The spelling of 28915617 in words is "twenty-eight million, nine hundred fifteen thousand, six hundred seventeen".