28977647291 has 2 divisors, whose sum is σ = 28977647292. Its totient is φ = 28977647290.

The previous prime is 28977647287. The next prime is 28977647311. The reversal of 28977647291 is 19274677982.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28977647291 - 2² = 28977647287 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (28977647591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14488823645 + 14488823646.

It is an arithmetic number, because the mean of its divisors is an integer number (14488823646).

Almost surely, 2^28977647291 is an apocalyptic number.

28977647291 is a deficient number, since it is larger than the sum of its proper divisors (1).

28977647291 is an equidigital number, since it uses as much as digits as its factorization.

28977647291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21337344, while the sum is 62.

The spelling of 28977647291 in words is "twenty-eight billion, nine hundred seventy-seven million, six hundred forty-seven thousand, two hundred ninety-one".