28790137 has 2 divisors, whose sum is σ = 28790138. Its totient is φ = 28790136.

The previous prime is 28790123. The next prime is 28790147. The reversal of 28790137 is 73109782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28132416 + 657721 = 5304^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 28790137 - 2⁷ = 28790009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28790096 and 28790105.

It is not a weakly prime, because it can be changed into another prime (28790147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14395068 + 14395069.

It is an arithmetic number, because the mean of its divisors is an integer number (14395069).

Almost surely, 2^28790137 is an apocalyptic number.

It is an amenable number.

28790137 is a deficient number, since it is larger than the sum of its proper divisors (1).

28790137 is an equidigital number, since it uses as much as digits as its factorization.

28790137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 28790137 is about 5365.6441365413. The cubic root of 28790137 is about 306.4887777125.

The spelling of 28790137 in words is "twenty-eight million, seven hundred ninety thousand, one hundred thirty-seven".