28331137247 has 4 divisors (see below), whose sum is σ = 32378442576. Its totient is φ = 24283831920.

The previous prime is 28331137229. The next prime is 28331137321. The reversal of 28331137247 is 74273113382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28331137247 - 2¹⁸ = 28330875103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28331137147) 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, 2023652654 + ... + 2023652667.

It is an arithmetic number, because the mean of its divisors is an integer number (8094610644).

Almost surely, 2^28331137247 is an apocalyptic number.

28331137247 is a deficient number, since it is larger than the sum of its proper divisors (4047305329).

28331137247 is an equidigital number, since it uses as much as digits as its factorization.

28331137247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4047305328.

The product of its digits is 169344, while the sum is 41.

The spelling of 28331137247 in words is "twenty-eight billion, three hundred thirty-one million, one hundred thirty-seven thousand, two hundred forty-seven".