28221176892 has 12 divisors (see below), whose sum is σ = 65849412776. Its totient is φ = 9407058960.

The previous prime is 28221176849. The next prime is 28221176903. The reversal of 28221176892 is 29867112282.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 1175882359 + ... + 1175882382.

Almost surely, 2^28221176892 is an apocalyptic number.

It is an amenable number.

28221176892 is an abundant number, since it is smaller than the sum of its proper divisors (37628235884).

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

28221176892 is a wasteful number, since it uses less digits than its factorization.

28221176892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351764748 (or 2351764746 counting only the distinct ones).

The product of its digits is 387072, while the sum is 48.

The spelling of 28221176892 in words is "twenty-eight billion, two hundred twenty-one million, one hundred seventy-six thousand, eight hundred ninety-two".