28872380 has 24 divisors (see below), whose sum is σ = 61366032. Its totient is φ = 11409152.

The previous prime is 28872379. The next prime is 28872397. The reversal of 28872380 is 8327882.

It is a super-2 number, since 2×28872380² = 1667228653728800, which contains 22 as substring.

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, 7037 + ... + 10356.

It is an arithmetic number, because the mean of its divisors is an integer number (2556918).

Almost surely, 2^28872380 is an apocalyptic number.

28872380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28872380 is an abundant number, since it is smaller than the sum of its proper divisors (32493652).

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

28872380 is a wasteful number, since it uses less digits than its factorization.

28872380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17485 (or 17483 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 28872380 is about 5373.3025226577. The cubic root of 28872380 is about 306.7803427551.

The spelling of 28872380 in words is "twenty-eight million, eight hundred seventy-two thousand, three hundred eighty".