28520325 has 18 divisors (see below), whose sum is σ = 51083474. Its totient is φ = 15210720.

The previous prime is 28520321. The next prime is 28520329. The reversal of 28520325 is 52302582.

It is an interprime number because it is at equal distance from previous prime (28520321) and next prime (28520329).

It can be written as a sum of positive squares in 3 ways, for example, as 1083681 + 27436644 = 1041^2 + 5238^2 .

It is not a de Polignac number, because 28520325 - 2² = 28520321 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28520321) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 63154 + ... + 63603.

Almost surely, 2^28520325 is an apocalyptic number.

28520325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28520325 is a deficient number, since it is larger than the sum of its proper divisors (22563149).

28520325 is a wasteful number, since it uses less digits than its factorization.

28520325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126773 (or 126765 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 28520325 is about 5340.4423974049. The cubic root of 28520325 is about 305.5283326834.

The spelling of 28520325 in words is "twenty-eight million, five hundred twenty thousand, three hundred twenty-five".