28465864 has 24 divisors (see below), whose sum is σ = 62088390. Its totient is φ = 12199488.

The previous prime is 28465861. The next prime is 28465867. The reversal of 28465864 is 46856482.

It is an interprime number because it is at equal distance from previous prime (28465861) and next prime (28465867).

It can be written as a sum of positive squares in only one way, i.e., 15920100 + 12545764 = 3990^2 + 3542^2 .

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28465864.

It is not an unprimeable number, because it can be changed into a prime (28465861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35917 + ... + 36700.

Almost surely, 2^28465864 is an apocalyptic number.

It is an amenable number.

28465864 is an abundant number, since it is smaller than the sum of its proper divisors (33622526).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28465864 is a wasteful number, since it uses less digits than its factorization.

28465864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72637 (or 72626 counting only the distinct ones).

The product of its digits is 368640, while the sum is 43.

The square root of 28465864 is about 5335.3410387716. The cubic root of 28465864 is about 305.3337348422. Note that the first 3 decimals are identical.

The spelling of 28465864 in words is "twenty-eight million, four hundred sixty-five thousand, eight hundred sixty-four".