28408025 has 12 divisors (see below), whose sum is σ = 35297964. Its totient is φ = 22680000.

The previous prime is 28408007. The next prime is 28408031. The reversal of 28408025 is 52080482.

It can be written as a sum of positive squares in 6 ways, for example, as 1149184 + 27258841 = 1072^2 + 5221^2 .

It is not a de Polignac number, because 28408025 - 2⁶ = 28407961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16715 + ... + 18335.

It is an arithmetic number, because the mean of its divisors is an integer number (2941497).

Almost surely, 2^28408025 is an apocalyptic number.

28408025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28408025 is a deficient number, since it is larger than the sum of its proper divisors (6889939).

28408025 is a wasteful number, since it uses less digits than its factorization.

28408025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332 (or 2327 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 29.

The square root of 28408025 is about 5329.9179168164. The cubic root of 28408025 is about 305.1267949030.

The spelling of 28408025 in words is "twenty-eight million, four hundred eight thousand, twenty-five".