28615231 has 8 divisors (see below), whose sum is σ = 29180160. Its totient is φ = 28054488.

The previous prime is 28615217. The next prime is 28615261. The reversal of 28615231 is 13251682.

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 28615231 - 2²³ = 20226623 is a prime.

It is a super-2 number, since 2×28615231² = 1637662890366722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28615231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28615261) 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, 15120 + ... + 16906.

It is an arithmetic number, because the mean of its divisors is an integer number (3647520).

Almost surely, 2^28615231 is an apocalyptic number.

28615231 is a deficient number, since it is larger than the sum of its proper divisors (564929).

28615231 is a wasteful number, since it uses less digits than its factorization.

28615231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093.

The product of its digits is 2880, while the sum is 28.

The square root of 28615231 is about 5349.3206110683. The cubic root of 28615231 is about 305.8668557984.

The spelling of 28615231 in words is "twenty-eight million, six hundred fifteen thousand, two hundred thirty-one".