28290191884 has 24 divisors (see below), whose sum is σ = 49614849648. Its totient is φ = 14114549760.

The previous prime is 28290191863. The next prime is 28290191903. The reversal of 28290191884 is 48819109282.

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, 7819644 + ... + 7823260.

It is an arithmetic number, because the mean of its divisors is an integer number (2067285402).

Almost surely, 2^28290191884 is an apocalyptic number.

It is an amenable number.

28290191884 is a deficient number, since it is larger than the sum of its proper divisors (21324657764).

28290191884 is a wasteful number, since it uses less digits than its factorization.

28290191884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7305 (or 7303 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 52.

The spelling of 28290191884 in words is "twenty-eight billion, two hundred ninety million, one hundred ninety-one thousand, eight hundred eighty-four".