28561425 has 12 divisors (see below), whose sum is σ = 47221680. Its totient is φ = 15232720.

The previous prime is 28561409. The next prime is 28561439. The reversal of 28561425 is 52416582.

It is not a de Polignac number, because 28561425 - 2⁴ = 28561409 is a prime.

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, 190335 + ... + 190484.

It is an arithmetic number, because the mean of its divisors is an integer number (3935140).

Almost surely, 2^28561425 is an apocalyptic number.

28561425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28561425 is a deficient number, since it is larger than the sum of its proper divisors (18660255).

28561425 is a wasteful number, since it uses less digits than its factorization.

28561425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380832 (or 380827 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

The square root of 28561425 is about 5344.2890079037. The cubic root of 28561425 is about 305.6750255807.

The spelling of 28561425 in words is "twenty-eight million, five hundred sixty-one thousand, four hundred twenty-five".