28761631 has 2 divisors, whose sum is σ = 28761632. Its totient is φ = 28761630.

The previous prime is 28761599. The next prime is 28761647. The reversal of 28761631 is 13616782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28761631 - 2⁵ = 28761599 is a prime.

It is a super-2 number, since 2×28761631² = 1654462835560322, which contains 22 as substring.

It is equal to p_1785832 and since 28761631 and 1785832 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28761731) 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, 14380815 + 14380816.

It is an arithmetic number, because the mean of its divisors is an integer number (14380816).

Almost surely, 2^28761631 is an apocalyptic number.

28761631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28761631 is an equidigital number, since it uses as much as digits as its factorization.

28761631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 28761631 is about 5362.9871340513. The cubic root of 28761631 is about 306.3875896541.

It can be divided in two parts, 28761 and 631, that added together give a palindrome (29392).

The spelling of 28761631 in words is "twenty-eight million, seven hundred sixty-one thousand, six hundred thirty-one".