28372872 has 32 divisors (see below), whose sum is σ = 77381280. Its totient is φ = 8597760.

The previous prime is 28372853. The next prime is 28372901. The reversal of 28372872 is 27827382.

It is a self number, because there is not a number n which added to its sum of digits gives 28372872.

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 7 ways as a sum of consecutive naturals, for example, 53473 + ... + 54000.

It is an arithmetic number, because the mean of its divisors is an integer number (2418165).

Almost surely, 2^28372872 is an apocalyptic number.

28372872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28372872 is an abundant number, since it is smaller than the sum of its proper divisors (49008408).

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

28372872 is a wasteful number, since it uses less digits than its factorization.

28372872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107493 (or 107489 counting only the distinct ones).

The product of its digits is 75264, while the sum is 39.

The square root of 28372872 is about 5326.6191904434. The cubic root of 28372872 is about 305.0008850642. Note that the first 3 decimals are identical.

Subtracting from 28372872 its reverse (27827382), we obtain a triangular number (545490 = T₁₀₄₄).

The spelling of 28372872 in words is "twenty-eight million, three hundred seventy-two thousand, eight hundred seventy-two".