28890715 has 16 divisors (see below), whose sum is σ = 39745728. Its totient is φ = 19748736.

The previous prime is 28890709. The next prime is 28890727. The reversal of 28890715 is 51709882.

It is not a de Polignac number, because 28890715 - 2⁵ = 28890683 is a prime.

It is a super-2 number, since 2×28890715² = 1669346826422450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11949 + ... + 14161.

It is an arithmetic number, because the mean of its divisors is an integer number (2484108).

Almost surely, 2^28890715 is an apocalyptic number.

28890715 is a deficient number, since it is larger than the sum of its proper divisors (10855013).

28890715 is a wasteful number, since it uses less digits than its factorization.

28890715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2598.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 28890715 is about 5375.0083720865. The cubic root of 28890715 is about 306.8452678652.

The spelling of 28890715 in words is "twenty-eight million, eight hundred ninety thousand, seven hundred fifteen".