28312972219 has 16 divisors (see below), whose sum is σ = 33276365568. Its totient is φ = 23587810272.

The previous prime is 28312972217. The next prime is 28312972231. The reversal of 28312972219 is 91227921382.

It is a happy number.

It is not a de Polignac number, because 28312972219 - 2¹ = 28312972217 is a prime.

It is a super-2 number, since 2×28312972219² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28312972217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 316917 + ... + 396310.

It is an arithmetic number, because the mean of its divisors is an integer number (2079772848).

Almost surely, 2^28312972219 is an apocalyptic number.

28312972219 is a deficient number, since it is larger than the sum of its proper divisors (4963393349).

28312972219 is a wasteful number, since it uses less digits than its factorization.

28312972219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713394.

The product of its digits is 217728, while the sum is 46.

The spelling of 28312972219 in words is "twenty-eight billion, three hundred twelve million, nine hundred seventy-two thousand, two hundred nineteen".