28767631 has 2 divisors, whose sum is σ = 28767632. Its totient is φ = 28767630.

The previous prime is 28767617. The next prime is 28767647. The reversal of 28767631 is 13676782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28767631 - 2⁹ = 28767119 is a prime.

It is a super-2 number, since 2×28767631² = 1655153186704322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28767601) 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, 14383815 + 14383816.

It is an arithmetic number, because the mean of its divisors is an integer number (14383816).

Almost surely, 2^28767631 is an apocalyptic number.

28767631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28767631 is an equidigital number, since it uses as much as digits as its factorization.

28767631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 28767631 is about 5363.5464946246. The cubic root of 28767631 is about 306.4088934728.

The spelling of 28767631 in words is "twenty-eight million, seven hundred sixty-seven thousand, six hundred thirty-one".