28381820292 has 72 divisors (see below), whose sum is σ = 83029856000. Its totient is φ = 8006439168.

The previous prime is 28381820287. The next prime is 28381820293. The reversal of 28381820292 is 29202818382.

28381820292 is a `hidden beast` number, since 283 + 8 + 1 + 82 + 0 + 292 = 666.

It is not an unprimeable number, because it can be changed into a prime (28381820293) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 692917 + ... + 732732.

Almost surely, 2^28381820292 is an apocalyptic number.

It is an amenable number.

28381820292 is an abundant number, since it is smaller than the sum of its proper divisors (54648035708).

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

28381820292 is a wasteful number, since it uses less digits than its factorization.

28381820292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425745 (or 1425740 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 28381820292 in words is "twenty-eight billion, three hundred eighty-one million, eight hundred twenty thousand, two hundred ninety-two".