28870392 has 32 divisors (see below), whose sum is σ = 73094400. Its totient is φ = 9501024.

The previous prime is 28870379. The next prime is 28870409. The reversal of 28870392 is 29307882.

It is a self number, because there is not a number n which added to its sum of digits gives 28870392.

It is a congruent number.

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, 5718 + ... + 9509.

It is an arithmetic number, because the mean of its divisors is an integer number (2284200).

Almost surely, 2^28870392 is an apocalyptic number.

It is an amenable number.

28870392 is an abundant number, since it is smaller than the sum of its proper divisors (44224008).

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

28870392 is a wasteful number, since it uses less digits than its factorization.

28870392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15315 (or 15311 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 28870392 is about 5373.1175308195. The cubic root of 28870392 is about 306.7733015007.

The spelling of 28870392 in words is "twenty-eight million, eight hundred seventy thousand, three hundred ninety-two".