28004825 has 24 divisors (see below), whose sum is σ = 36009600. Its totient is φ = 21591360.

The previous prime is 28004813. The next prime is 28004833. The reversal of 28004825 is 52840082.

It is not a de Polignac number, because 28004825 - 2⁶ = 28004761 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117056 + ... + 117294.

It is an arithmetic number, because the mean of its divisors is an integer number (1500400).

Almost surely, 2^28004825 is an apocalyptic number.

28004825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28004825 is a deficient number, since it is larger than the sum of its proper divisors (8004775).

28004825 is a wasteful number, since it uses less digits than its factorization.

28004825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 396 counting only the distinct ones).

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

The square root of 28004825 is about 5291.9585221353. The cubic root of 28004825 is about 303.6763384974.

The spelling of 28004825 in words is "twenty-eight million, four thousand, eight hundred twenty-five".