28117140 has 24 divisors (see below), whose sum is σ = 78728160. Its totient is φ = 7497888.

The previous prime is 28117129. The next prime is 28117181. The reversal of 28117140 is 4171182.

It is a self number, because there is not a number n which added to its sum of digits gives 28117140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234250 + ... + 234369.

It is an arithmetic number, because the mean of its divisors is an integer number (3280340).

Almost surely, 2^28117140 is an apocalyptic number.

28117140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28117140 is an abundant number, since it is smaller than the sum of its proper divisors (50611020).

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

28117140 is a wasteful number, since it uses less digits than its factorization.

28117140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468631 (or 468629 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 28117140 is about 5302.5597592106. The cubic root of 28117140 is about 304.0817675939.

The spelling of 28117140 in words is "twenty-eight million, one hundred seventeen thousand, one hundred forty".