28357880 has 32 divisors (see below), whose sum is σ = 67165200. Its totient is φ = 10745856.

The previous prime is 28357867. The next prime is 28357883. The reversal of 28357880 is 8875382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28357883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17897 + ... + 19416.

Almost surely, 2^28357880 is an apocalyptic number.

28357880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28357880 is an abundant number, since it is smaller than the sum of its proper divisors (38807320).

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

28357880 is a wasteful number, since it uses less digits than its factorization.

28357880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37343 (or 37339 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 28357880 is about 5325.2117328797. The cubic root of 28357880 is about 304.9471555853.

The spelling of 28357880 in words is "twenty-eight million, three hundred fifty-seven thousand, eight hundred eighty".