28585631 has 2 divisors, whose sum is σ = 28585632. Its totient is φ = 28585630.

The previous prime is 28585621. The next prime is 28585649. The reversal of 28585631 is 13658582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28585631 - 2⁶ = 28585567 is a prime.

It is a super-2 number, since 2×28585631² = 1634276599336322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28585621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14292815 + 14292816.

It is an arithmetic number, because the mean of its divisors is an integer number (14292816).

Almost surely, 2^28585631 is an apocalyptic number.

28585631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28585631 is an equidigital number, since it uses as much as digits as its factorization.

28585631 is an odious number, because the sum of its binary digits is odd.

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

The square root of 28585631 is about 5346.5531887376. The cubic root of 28585631 is about 305.7613550778.

The spelling of 28585631 in words is "twenty-eight million, five hundred eighty-five thousand, six hundred thirty-one".