28890137 has 2 divisors, whose sum is σ = 28890138. Its totient is φ = 28890136.

The previous prime is 28890133. The next prime is 28890143. The reversal of 28890137 is 73109882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28686736 + 203401 = 5356^2 + 451^2 .

It is a cyclic number.

It is not a de Polignac number, because 28890137 - 2² = 28890133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28890137.

It is not a weakly prime, because it can be changed into another prime (28890131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14445068 + 14445069.

It is an arithmetic number, because the mean of its divisors is an integer number (14445069).

Almost surely, 2^28890137 is an apocalyptic number.

It is an amenable number.

28890137 is a deficient number, since it is larger than the sum of its proper divisors (1).

28890137 is an equidigital number, since it uses as much as digits as its factorization.

28890137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28890137 is about 5374.9546044595. The cubic root of 28890137 is about 306.8432215590.

The spelling of 28890137 in words is "twenty-eight million, eight hundred ninety thousand, one hundred thirty-seven".