28900117 has 2 divisors, whose sum is σ = 28900118. Its totient is φ = 28900116.

The previous prime is 28900111. The next prime is 28900129. The reversal of 28900117 is 71100982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25492401 + 3407716 = 5049^2 + 1846^2 .

It is a cyclic number.

It is not a de Polignac number, because 28900117 - 2²³ = 20511509 is a prime.

It is a super-2 number, since 2×28900117² = 1670433525227378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28900111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14450058 + 14450059.

It is an arithmetic number, because the mean of its divisors is an integer number (14450059).

Almost surely, 2^28900117 is an apocalyptic number.

It is an amenable number.

28900117 is a deficient number, since it is larger than the sum of its proper divisors (1).

28900117 is an equidigital number, since it uses as much as digits as its factorization.

28900117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 28900117 is about 5375.8829042307. The cubic root of 28900117 is about 306.8785501419.

It can be divided in two parts, 28900 and 117, that multiplied together give a triangular number (3381300 = T₂₆₀₀).

The spelling of 28900117 in words is "twenty-eight million, nine hundred thousand, one hundred seventeen".