28407225 has 48 divisors (see below), whose sum is σ = 58567680. Its totient is φ = 11803200.

The previous prime is 28407217. The next prime is 28407227. The reversal of 28407225 is 52270482.

It is not a de Polignac number, because 28407225 - 2³ = 28407217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28407192 and 28407201.

It is not an unprimeable number, because it can be changed into a prime (28407227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3316 + ... + 8234.

It is an arithmetic number, because the mean of its divisors is an integer number (1220160).

Almost surely, 2^28407225 is an apocalyptic number.

28407225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28407225 is an abundant number, since it is smaller than the sum of its proper divisors (30160455).

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

28407225 is a wasteful number, since it uses less digits than its factorization.

28407225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4950 (or 4945 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 28407225 is about 5329.8428682279. The cubic root of 28407225 is about 305.1239306451.

It can be divided in two parts, 28 and 407225, that added together give a triangular number (407253 = T₉₀₂).

The spelling of 28407225 in words is "twenty-eight million, four hundred seven thousand, two hundred twenty-five".