28240625 has 24 divisors (see below), whose sum is σ = 40372416. Its totient is φ = 19350000.

The previous prime is 28240613. The next prime is 28240627. The reversal of 28240625 is 52604282.

It is not a de Polignac number, because 28240625 - 2¹⁴ = 28224241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28240627) 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, 21230 + ... + 22520.

It is an arithmetic number, because the mean of its divisors is an integer number (1682184).

Almost surely, 2^28240625 is an apocalyptic number.

28240625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28240625 is a deficient number, since it is larger than the sum of its proper divisors (12131791).

28240625 is an frugal number, since it uses more digits than its factorization.

28240625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323 (or 1303 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 29.

The square root of 28240625 is about 5314.1909073724. The cubic root of 28240625 is about 304.5262734566.

The spelling of 28240625 in words is "twenty-eight million, two hundred forty thousand, six hundred twenty-five".