28357397 has 2 divisors, whose sum is σ = 28357398. Its totient is φ = 28357396.

The previous prime is 28357391. The next prime is 28357409. The reversal of 28357397 is 79375382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25816561 + 2540836 = 5081^2 + 1594^2 .

It is a cyclic number.

It is not a de Polignac number, because 28357397 - 2⁶ = 28357333 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28357391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14178698 + 14178699.

It is an arithmetic number, because the mean of its divisors is an integer number (14178699).

Almost surely, 2^28357397 is an apocalyptic number.

It is an amenable number.

28357397 is a deficient number, since it is larger than the sum of its proper divisors (1).

28357397 is an equidigital number, since it uses as much as digits as its factorization.

28357397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 44.

The square root of 28357397 is about 5325.1663823772. The cubic root of 28357397 is about 304.9454242581.

The spelling of 28357397 in words is "twenty-eight million, three hundred fifty-seven thousand, three hundred ninety-seven".