28690836631 has 2 divisors, whose sum is σ = 28690836632. Its totient is φ = 28690836630.

The previous prime is 28690836599. The next prime is 28690836667. The reversal of 28690836631 is 13663809682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28690836631 - 2⁵ = 28690836599 is a prime.

It is a super-2 number, since 2×28690836631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28690837631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14345418315 + 14345418316.

It is an arithmetic number, because the mean of its divisors is an integer number (14345418316).

Almost surely, 2^28690836631 is an apocalyptic number.

28690836631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28690836631 is an equidigital number, since it uses as much as digits as its factorization.

28690836631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2239488, while the sum is 52.

The spelling of 28690836631 in words is "twenty-eight billion, six hundred ninety million, eight hundred thirty-six thousand, six hundred thirty-one".