28428325 has 12 divisors (see below), whose sum is σ = 35380548. Its totient is φ = 22659200.

The previous prime is 28428307. The next prime is 28428331. The reversal of 28428325 is 52382482.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1117249 + 27311076 = 1057^2 + 5226^2 .

It is not a de Polignac number, because 28428325 - 2⁹ = 28427813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5385 + ... + 9265.

It is an arithmetic number, because the mean of its divisors is an integer number (2948379).

Almost surely, 2^28428325 is an apocalyptic number.

28428325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28428325 is a deficient number, since it is larger than the sum of its proper divisors (6952223).

28428325 is a wasteful number, since it uses less digits than its factorization.

28428325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4184 (or 4179 counting only the distinct ones).

The product of its digits is 30720, while the sum is 34.

The square root of 28428325 is about 5331.8219212573. The cubic root of 28428325 is about 305.1994574590.

The spelling of 28428325 in words is "twenty-eight million, four hundred twenty-eight thousand, three hundred twenty-five".