28113641 has 2 divisors, whose sum is σ = 28113642. Its totient is φ = 28113640.

The previous prime is 28113629. The next prime is 28113667. The reversal of 28113641 is 14631182.

It is an a-pointer prime, because the next prime (28113667) can be obtained adding 28113641 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21353641 + 6760000 = 4621^2 + 2600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28113641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28113641.

It is not a weakly prime, because it can be changed into another prime (28113601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14056820 + 14056821.

It is an arithmetic number, because the mean of its divisors is an integer number (14056821).

Almost surely, 2^28113641 is an apocalyptic number.

It is an amenable number.

28113641 is a deficient number, since it is larger than the sum of its proper divisors (1).

28113641 is an equidigital number, since it uses as much as digits as its factorization.

28113641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 28113641 is about 5302.2298139556. The cubic root of 28113641 is about 304.0691533873.

The spelling of 28113641 in words is "twenty-eight million, one hundred thirteen thousand, six hundred forty-one".