28861615 has 8 divisors (see below), whose sum is σ = 34716528. Its totient is φ = 23034240.

The previous prime is 28861607. The next prime is 28861667. The reversal of 28861615 is 51616882.

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

It is not a de Polignac number, because 28861615 - 2³ = 28861607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4501 + ... + 8830.

It is an arithmetic number, because the mean of its divisors is an integer number (4339566).

Almost surely, 2^28861615 is an apocalyptic number.

28861615 is a deficient number, since it is larger than the sum of its proper divisors (5854913).

28861615 is a wasteful number, since it uses less digits than its factorization.

28861615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13769.

The product of its digits is 23040, while the sum is 37.

The square root of 28861615 is about 5372.3007175697. The cubic root of 28861615 is about 306.7422105689.

The spelling of 28861615 in words is "twenty-eight million, eight hundred sixty-one thousand, six hundred fifteen".