28961315 has 4 divisors (see below), whose sum is σ = 34753584. Its totient is φ = 23169048.

The previous prime is 28961291. The next prime is 28961323. The reversal of 28961315 is 51316982.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28961315 - 2²⁰ = 27912739 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2896127 + ... + 2896136.

It is an arithmetic number, because the mean of its divisors is an integer number (8688396).

Almost surely, 2^28961315 is an apocalyptic number.

28961315 is a deficient number, since it is larger than the sum of its proper divisors (5792269).

28961315 is an equidigital number, since it uses as much as digits as its factorization.

28961315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5792268.

The product of its digits is 12960, while the sum is 35.

The square root of 28961315 is about 5381.5717964178. The cubic root of 28961315 is about 307.0950096214.

The spelling of 28961315 in words is "twenty-eight million, nine hundred sixty-one thousand, three hundred fifteen".