28311857313 has 4 divisors (see below), whose sum is σ = 37749143088. Its totient is φ = 18874571540.

The previous prime is 28311857309. The next prime is 28311857323. The reversal of 28311857313 is 31375811382.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28311857313 - 2² = 28311857309 is a prime.

It is a super-2 number, since 2×28311857313² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28311857323) 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, 4718642883 + ... + 4718642888.

It is an arithmetic number, because the mean of its divisors is an integer number (9437285772).

Almost surely, 2^28311857313 is an apocalyptic number.

It is an amenable number.

28311857313 is a deficient number, since it is larger than the sum of its proper divisors (9437285775).

28311857313 is an equidigital number, since it uses as much as digits as its factorization.

28311857313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9437285774.

The product of its digits is 120960, while the sum is 42.

The spelling of 28311857313 in words is "twenty-eight billion, three hundred eleven million, eight hundred fifty-seven thousand, three hundred thirteen".