28191912 has 32 divisors (see below), whose sum is σ = 80548800. Its totient is φ = 8054784.

The previous prime is 28191893. The next prime is 28191923. The reversal of 28191912 is 21919182.

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, 83737 + ... + 84072.

It is an arithmetic number, because the mean of its divisors is an integer number (2517150).

Almost surely, 2^28191912 is an apocalyptic number.

It is an amenable number.

28191912 is an abundant number, since it is smaller than the sum of its proper divisors (52356888).

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

28191912 is a wasteful number, since it uses less digits than its factorization.

28191912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167825 (or 167821 counting only the distinct ones).

The product of its digits is 2592, while the sum is 33.

The square root of 28191912 is about 5309.6056350731. The cubic root of 28191912 is about 304.3510775470.

The spelling of 28191912 in words is "twenty-eight million, one hundred ninety-one thousand, nine hundred twelve".