28253857 has 2 divisors, whose sum is σ = 28253858. Its totient is φ = 28253856.

The previous prime is 28253831. The next prime is 28253887. The reversal of 28253857 is 75835282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19633761 + 8620096 = 4431^2 + 2936^2 .

It is a cyclic number.

It is not a de Polignac number, because 28253857 - 2²³ = 19865249 is a prime.

It is not a weakly prime, because it can be changed into another prime (28253807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14126928 + 14126929.

It is an arithmetic number, because the mean of its divisors is an integer number (14126929).

Almost surely, 2^28253857 is an apocalyptic number.

It is an amenable number.

28253857 is a deficient number, since it is larger than the sum of its proper divisors (1).

28253857 is an equidigital number, since it uses as much as digits as its factorization.

28253857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134400, while the sum is 40.

The square root of 28253857 is about 5315.4357300225. The cubic root of 28253857 is about 304.5738274382.

The spelling of 28253857 in words is "twenty-eight million, two hundred fifty-three thousand, eight hundred fifty-seven".