28558631 has 2 divisors, whose sum is σ = 28558632. Its totient is φ = 28558630.

The previous prime is 28558627. The next prime is 28558633. The reversal of 28558631 is 13685582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28558631 - 2² = 28558627 is a prime.

It is a super-2 number, since 2×28558631² = 1631190809188322, which contains 22 as substring.

Together with 28558633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28558633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14279315 + 14279316.

It is an arithmetic number, because the mean of its divisors is an integer number (14279316).

Almost surely, 2^28558631 is an apocalyptic number.

28558631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28558631 is an equidigital number, since it uses as much as digits as its factorization.

28558631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 38.

The square root of 28558631 is about 5344.0276009766. The cubic root of 28558631 is about 305.6650577789.

The spelling of 28558631 in words is "twenty-eight million, five hundred fifty-eight thousand, six hundred thirty-one".