28236631 has 2 divisors, whose sum is σ = 28236632. Its totient is φ = 28236630.

The previous prime is 28236583. The next prime is 28236647. The reversal of 28236631 is 13663282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28236631 - 2⁹ = 28236119 is a prime.

It is a super-2 number, since 2×28236631² = 1594614660460322, which contains 22 as substring.

It is equal to p_1755238 and since 28236631 and 1755238 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 28236593 and 28236602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28236731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14118315 + 14118316.

It is an arithmetic number, because the mean of its divisors is an integer number (14118316).

Almost surely, 2^28236631 is an apocalyptic number.

28236631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28236631 is an equidigital number, since it uses as much as digits as its factorization.

28236631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 28236631 is about 5313.8151078110. The cubic root of 28236631 is about 304.5119166535.

The spelling of 28236631 in words is "twenty-eight million, two hundred thirty-six thousand, six hundred thirty-one".