28181445928 has 16 divisors (see below), whose sum is σ = 52882200000. Its totient is φ = 14079525936.

The previous prime is 28181445839. The next prime is 28181445959. The reversal of 28181445928 is 82954418182.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1388928 + ... + 1409071.

It is an arithmetic number, because the mean of its divisors is an integer number (3305137500).

Almost surely, 2^28181445928 is an apocalyptic number.

It is an amenable number.

28181445928 is a deficient number, since it is larger than the sum of its proper divisors (24700754072).

28181445928 is a wasteful number, since it uses less digits than its factorization.

28181445928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2799264 (or 2799260 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 52.

The spelling of 28181445928 in words is "twenty-eight billion, one hundred eighty-one million, four hundred forty-five thousand, nine hundred twenty-eight".