28311257099 has 4 divisors (see below), whose sum is σ = 28311637464. Its totient is φ = 28310876736.

The previous prime is 28311257063. The next prime is 28311257153. The reversal of 28311257099 is 99075211382.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28311257099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28311257399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37877 + ... + 240950.

It is an arithmetic number, because the mean of its divisors is an integer number (7077909366).

Almost surely, 2^28311257099 is an apocalyptic number.

28311257099 is a deficient number, since it is larger than the sum of its proper divisors (380365).

28311257099 is a wasteful number, since it uses less digits than its factorization.

28311257099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380364.

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 28311257099 in words is "twenty-eight billion, three hundred eleven million, two hundred fifty-seven thousand, ninety-nine".