28722180231 has 8 divisors (see below), whose sum is σ = 42551378160. Its totient is φ = 19148120136.

The previous prime is 28722180209. The next prime is 28722180239. The reversal of 28722180231 is 13208122782.

It is not a de Polignac number, because 28722180231 - 2¹⁰ = 28722179207 is a prime.

It is a super-2 number, since 2×28722180231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28722180239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 531892200 + ... + 531892253.

It is an arithmetic number, because the mean of its divisors is an integer number (5318922270).

Almost surely, 2^28722180231 is an apocalyptic number.

28722180231 is a deficient number, since it is larger than the sum of its proper divisors (13829197929).

28722180231 is a wasteful number, since it uses less digits than its factorization.

28722180231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063784462 (or 1063784456 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The spelling of 28722180231 in words is "twenty-eight billion, seven hundred twenty-two million, one hundred eighty thousand, two hundred thirty-one".