28361656251 has 32 divisors (see below), whose sum is σ = 42170250240. Its totient is φ = 18839066400.

The previous prime is 28361656249. The next prime is 28361656289. The reversal of 28361656251 is 15265616382.

28361656251 is a `hidden beast` number, since 2 + 8 + 3 + 6 + 16 + 5 + 625 + 1 = 666.

It is not a de Polignac number, because 28361656251 - 2¹ = 28361656249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28361656197 and 28361656206.

It is not an unprimeable number, because it can be changed into a prime (28361656051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11762236 + ... + 11764646.

It is an arithmetic number, because the mean of its divisors is an integer number (1317820320).

Almost surely, 2^28361656251 is an apocalyptic number.

28361656251 is a deficient number, since it is larger than the sum of its proper divisors (13808593989).

28361656251 is a wasteful number, since it uses less digits than its factorization.

28361656251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3824 (or 3818 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The spelling of 28361656251 in words is "twenty-eight billion, three hundred sixty-one million, six hundred fifty-six thousand, two hundred fifty-one".