28312219831 has 32 divisors (see below), whose sum is σ = 33785579520. Its totient is φ = 23220497664.

The previous prime is 28312219829. The next prime is 28312219841. The reversal of 28312219831 is 13891221382.

It is not a de Polignac number, because 28312219831 - 2¹ = 28312219829 is a prime.

It is a super-2 number, since 2×28312219831² (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 (28312219801) 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, 17595355 + ... + 17596963.

It is an arithmetic number, because the mean of its divisors is an integer number (1055799360).

Almost surely, 2^28312219831 is an apocalyptic number.

28312219831 is a deficient number, since it is larger than the sum of its proper divisors (5473359689).

28312219831 is a wasteful number, since it uses less digits than its factorization.

28312219831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2815.

The product of its digits is 41472, while the sum is 40.

The spelling of 28312219831 in words is "twenty-eight billion, three hundred twelve million, two hundred nineteen thousand, eight hundred thirty-one".