28011681172 has 12 divisors (see below), whose sum is σ = 49029856960. Its totient is φ = 14003150616.

The previous prime is 28011681169. The next prime is 28011681179. The reversal of 28011681172 is 27118611082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28011681179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 648972 + ... + 690787.

Almost surely, 2^28011681172 is an apocalyptic number.

It is an amenable number.

28011681172 is a deficient number, since it is larger than the sum of its proper divisors (21018175788).

28011681172 is a wasteful number, since it uses less digits than its factorization.

28011681172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344990 (or 1344988 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 37.

The spelling of 28011681172 in words is "twenty-eight billion, eleven million, six hundred eighty-one thousand, one hundred seventy-two".