28315697 has 4 divisors (see below), whose sum is σ = 28326900. Its totient is φ = 28304496.

The previous prime is 28315673. The next prime is 28315709. The reversal of 28315697 is 79651382.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 25090081 + 3225616 = 5009^2 + 1796^2 .

It is a cyclic number.

It is not a de Polignac number, because 28315697 - 2¹² = 28311601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28315597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179 + ... + 7527.

It is an arithmetic number, because the mean of its divisors is an integer number (7081725).

Almost surely, 2^28315697 is an apocalyptic number.

It is an amenable number.

28315697 is a deficient number, since it is larger than the sum of its proper divisors (11203).

28315697 is an equidigital number, since it uses as much as digits as its factorization.

28315697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11202.

The product of its digits is 90720, while the sum is 41.

The square root of 28315697 is about 5321.2495712943. The cubic root of 28315697 is about 304.7958752424.

The spelling of 28315697 in words is "twenty-eight million, three hundred fifteen thousand, six hundred ninety-seven".