28615291 has 8 divisors (see below), whose sum is σ = 29109920. Its totient is φ = 28124928.

The previous prime is 28615277. The next prime is 28615297. The reversal of 28615291 is 19251682.

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 28615291 - 2¹¹ = 28613243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28615297) 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, 14290 + ... + 16168.

It is an arithmetic number, because the mean of its divisors is an integer number (3638740).

Almost surely, 2^28615291 is an apocalyptic number.

28615291 is a deficient number, since it is larger than the sum of its proper divisors (494629).

28615291 is a wasteful number, since it uses less digits than its factorization.

28615291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133.

The product of its digits is 8640, while the sum is 34.

The square root of 28615291 is about 5349.3262192542. The cubic root of 28615291 is about 305.8670695773.

The spelling of 28615291 in words is "twenty-eight million, six hundred fifteen thousand, two hundred ninety-one".