28386131 has 2 divisors, whose sum is σ = 28386132. Its totient is φ = 28386130.

The previous prime is 28386121. The next prime is 28386143. The reversal of 28386131 is 13168382.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28386131 is a prime.

It is a super-2 number, since 2×28386131² = 1611544866298322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28386101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14193065 + 14193066.

It is an arithmetic number, because the mean of its divisors is an integer number (14193066).

Almost surely, 2^28386131 is an apocalyptic number.

28386131 is a deficient number, since it is larger than the sum of its proper divisors (1).

28386131 is an equidigital number, since it uses as much as digits as its factorization.

28386131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 28386131 is about 5327.8636431500. The cubic root of 28386131 is about 305.0483879155.

The spelling of 28386131 in words is "twenty-eight million, three hundred eighty-six thousand, one hundred thirty-one".