28465815 has 24 divisors (see below), whose sum is σ = 52982640. Its totient is φ = 13012608.

The previous prime is 28465813. The next prime is 28465841. The reversal of 28465815 is 51856482.

It is not a de Polignac number, because 28465815 - 2¹ = 28465813 is a prime.

It is a super-2 number, since 2×28465815² = 1620605247228450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28465813) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18630 + ... + 20099.

It is an arithmetic number, because the mean of its divisors is an integer number (2207610).

Almost surely, 2^28465815 is an apocalyptic number.

28465815 is a deficient number, since it is larger than the sum of its proper divisors (24516825).

28465815 is a wasteful number, since it uses less digits than its factorization.

28465815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38751 (or 38744 counting only the distinct ones).

The product of its digits is 76800, while the sum is 39.

The square root of 28465815 is about 5335.3364467482. The cubic root of 28465815 is about 305.3335596457. Note that the first 3 decimals are identical.

The spelling of 28465815 in words is "twenty-eight million, four hundred sixty-five thousand, eight hundred fifteen".