28605631 has 2 divisors, whose sum is σ = 28605632. Its totient is φ = 28605630.

The previous prime is 28605623. The next prime is 28605641. The reversal of 28605631 is 13650682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28605631 - 2³ = 28605623 is a prime.

It is a super-2 number, since 2×28605631² = 1636564249816322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28605593 and 28605602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28605601) 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, 14302815 + 14302816.

It is an arithmetic number, because the mean of its divisors is an integer number (14302816).

Almost surely, 2^28605631 is an apocalyptic number.

28605631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28605631 is an equidigital number, since it uses as much as digits as its factorization.

28605631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 28605631 is about 5348.4232255871. The cubic root of 28605631 is about 305.8326473235.

The spelling of 28605631 in words is "twenty-eight million, six hundred five thousand, six hundred thirty-one".