28355880 has 64 divisors (see below), whose sum is σ = 97223040. Its totient is φ = 6481152.

The previous prime is 28355869. The next prime is 28355891. The reversal of 28355880 is 8855382.

It is an interprime number because it is at equal distance from previous prime (28355869) and next prime (28355891).

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 15 ways as a sum of consecutive naturals, for example, 16039 + ... + 17718.

It is an arithmetic number, because the mean of its divisors is an integer number (1519110).

Almost surely, 2^28355880 is an apocalyptic number.

28355880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28355880 is an abundant number, since it is smaller than the sum of its proper divisors (68867160).

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

28355880 is a wasteful number, since it uses less digits than its factorization.

28355880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33778 (or 33774 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 39.

The square root of 28355880 is about 5325.0239436081. The cubic root of 28355880 is about 304.9399864005.

The spelling of 28355880 in words is "twenty-eight million, three hundred fifty-five thousand, eight hundred eighty".