28385100 has 72 divisors (see below), whose sum is σ = 91261520. Its totient is φ = 7568640.

The previous prime is 28385081. The next prime is 28385111. The reversal of 28385100 is 158382.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2557 + ... + 7956.

Almost surely, 2^28385100 is an apocalyptic number.

28385100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28385100 is an abundant number, since it is smaller than the sum of its proper divisors (62876420).

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

28385100 is a wasteful number, since it uses less digits than its factorization.

28385100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10536 (or 10523 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 28385100 is about 5327.7668867923. The cubic root of 28385100 is about 305.0446946953.

The spelling of 28385100 in words is "twenty-eight million, three hundred eighty-five thousand, one hundred".