28804157 has 2 divisors, whose sum is σ = 28804158. Its totient is φ = 28804156.

The previous prime is 28804151. The next prime is 28804183. The reversal of 28804157 is 75140882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28793956 + 10201 = 5366^2 + 101^2 .

It is a cyclic number.

It is not a de Polignac number, because 28804157 - 2¹⁰ = 28803133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28804151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14402078 + 14402079.

It is an arithmetic number, because the mean of its divisors is an integer number (14402079).

Almost surely, 2^28804157 is an apocalyptic number.

It is an amenable number.

28804157 is a deficient number, since it is larger than the sum of its proper divisors (1).

28804157 is an equidigital number, since it uses as much as digits as its factorization.

28804157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 28804157 is about 5366.9504376322. The cubic root of 28804157 is about 306.5385201568.

The spelling of 28804157 in words is "twenty-eight million, eight hundred four thousand, one hundred fifty-seven".