28306749131 has 8 divisors (see below), whose sum is σ = 29216178240. Its totient is φ = 27411641928.

The previous prime is 28306749019. The next prime is 28306749139. The reversal of 28306749131 is 13194760382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-28306749131 is a prime.

It is a super-2 number, since 2×28306749131² (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 (28306749139) 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, 3576461 + ... + 3584366.

It is an arithmetic number, because the mean of its divisors is an integer number (3652022280).

Almost surely, 2^28306749131 is an apocalyptic number.

28306749131 is a deficient number, since it is larger than the sum of its proper divisors (909429109).

28306749131 is an equidigital number, since it uses as much as digits as its factorization.

28306749131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7160953.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 28306749131 in words is "twenty-eight billion, three hundred six million, seven hundred forty-nine thousand, one hundred thirty-one".