28359931 has 2 divisors, whose sum is σ = 28359932. Its totient is φ = 28359930.

The previous prime is 28359911. The next prime is 28359967. The reversal of 28359931 is 13995382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28359931 - 2¹¹ = 28357883 is a prime.

It is a super-2 number, since 2×28359931² = 1608571372649522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28359911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14179965 + 14179966.

It is an arithmetic number, because the mean of its divisors is an integer number (14179966).

Almost surely, 2^28359931 is an apocalyptic number.

28359931 is a deficient number, since it is larger than the sum of its proper divisors (1).

28359931 is an equidigital number, since it uses as much as digits as its factorization.

28359931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 28359931 is about 5325.4043039003. The cubic root of 28359931 is about 304.9545072343.

The spelling of 28359931 in words is "twenty-eight million, three hundred fifty-nine thousand, nine hundred thirty-one".