28556140 has 24 divisors (see below), whose sum is σ = 60792480. Its totient is φ = 11265408.

The previous prime is 28556123. The next prime is 28556149. The reversal of 28556140 is 4165582.

It is not an unprimeable number, because it can be changed into a prime (28556149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8320 + ... + 11239.

It is an arithmetic number, because the mean of its divisors is an integer number (2533020).

Almost surely, 2^28556140 is an apocalyptic number.

28556140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28556140 is an abundant number, since it is smaller than the sum of its proper divisors (32236340).

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

28556140 is a wasteful number, since it uses less digits than its factorization.

28556140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19641 (or 19639 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 28556140 is about 5343.7945319782. The cubic root of 28556140 is about 305.6561704038.

The spelling of 28556140 in words is "twenty-eight million, five hundred fifty-six thousand, one hundred forty".