28920113 has 2 divisors, whose sum is σ = 28920114. Its totient is φ = 28920112.

The previous prime is 28920097. The next prime is 28920149. The reversal of 28920113 is 31102982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15429184 + 13490929 = 3928^2 + 3673^2 .

It is a cyclic number.

It is not a de Polignac number, because 28920113 - 2⁴ = 28920097 is a prime.

It is not a weakly prime, because it can be changed into another prime (28920173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14460056 + 14460057.

It is an arithmetic number, because the mean of its divisors is an integer number (14460057).

Almost surely, 2^28920113 is an apocalyptic number.

It is an amenable number.

28920113 is a deficient number, since it is larger than the sum of its proper divisors (1).

28920113 is an equidigital number, since it uses as much as digits as its factorization.

28920113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 28920113 is about 5377.7423701773. The cubic root of 28920113 is about 306.9493102798.

It can be divided in two parts, 289 and 20113, that added together give a palindrome (20402).

The spelling of 28920113 in words is "twenty-eight million, nine hundred twenty thousand, one hundred thirteen".