28299375 has 100 divisors (see below), whose sum is σ = 58212616. Its totient is φ = 13608000.

The previous prime is 28299371. The next prime is 28299377. The reversal of 28299375 is 57399282.

It is not a de Polignac number, because 28299375 - 2² = 28299371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28299375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28299371) by changing a digit.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 658104 + ... + 658146.

Almost surely, 2^28299375 is an apocalyptic number.

28299375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28299375 is an abundant number, since it is smaller than the sum of its proper divisors (29913241).

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

28299375 is an equidigital number, since it uses as much as digits as its factorization.

28299375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 64 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 28299375 is about 5319.7156878916. The cubic root of 28299375 is about 304.7372995524.

The spelling of 28299375 in words is "twenty-eight million, two hundred ninety-nine thousand, three hundred seventy-five".