28399252 has 12 divisors (see below), whose sum is σ = 56798560. Its totient is φ = 12171096.

The previous prime is 28399249. The next prime is 28399253. The reversal of 28399252 is 25299382.

28399252 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28399253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507102 + ... + 507157.

Almost surely, 2^28399252 is an apocalyptic number.

It is an amenable number.

28399252 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28399252 is a wasteful number, since it uses less digits than its factorization.

28399252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014270 (or 1014268 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 28399252 is about 5329.0948574781. The cubic root of 28399252 is about 305.0953817961.

The spelling of 28399252 in words is "twenty-eight million, three hundred ninety-nine thousand, two hundred fifty-two".