28897140 has 24 divisors (see below), whose sum is σ = 80912160. Its totient is φ = 7705888.

The previous prime is 28897139. The next prime is 28897163. The reversal of 28897140 is 4179882.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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, 240750 + ... + 240869.

It is an arithmetic number, because the mean of its divisors is an integer number (3371340).

Almost surely, 2^28897140 is an apocalyptic number.

28897140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28897140 is an abundant number, since it is smaller than the sum of its proper divisors (52015020).

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

28897140 is a wasteful number, since it uses less digits than its factorization.

28897140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481631 (or 481629 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 28897140 is about 5375.6060123487. The cubic root of 28897140 is about 306.8680125973.

The spelling of 28897140 in words is "twenty-eight million, eight hundred ninety-seven thousand, one hundred forty".