28587631 has 2 divisors, whose sum is σ = 28587632. Its totient is φ = 28587630.

The previous prime is 28587583. The next prime is 28587641. The reversal of 28587631 is 13678582.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28587631 is a prime.

It is a super-2 number, since 2×28587631² = 1634505292384322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28587641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14293815 + 14293816.

It is an arithmetic number, because the mean of its divisors is an integer number (14293816).

Almost surely, 2^28587631 is an apocalyptic number.

28587631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28587631 is an equidigital number, since it uses as much as digits as its factorization.

28587631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 28587631 is about 5346.7402218548. The cubic root of 28587631 is about 305.7684857985.

The spelling of 28587631 in words is "twenty-eight million, five hundred eighty-seven thousand, six hundred thirty-one".