28472825 has 12 divisors (see below), whose sum is σ = 35375340. Its totient is φ = 22733760.

The previous prime is 28472813. The next prime is 28472831. The reversal of 28472825 is 52827482.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 4541161 + 23931664 = 2131^2 + 4892^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28472825 is a prime.

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, 19211 + ... + 20639.

It is an arithmetic number, because the mean of its divisors is an integer number (2947945).

Almost surely, 2^28472825 is an apocalyptic number.

28472825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28472825 is a deficient number, since it is larger than the sum of its proper divisors (6902515).

28472825 is a wasteful number, since it uses less digits than its factorization.

28472825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236 (or 2231 counting only the distinct ones).

The product of its digits is 71680, while the sum is 38.

The square root of 28472825 is about 5335.9933470723. The cubic root of 28472825 is about 305.3586214327.

The spelling of 28472825 in words is "twenty-eight million, four hundred seventy-two thousand, eight hundred twenty-five".