28597213 has 16 divisors (see below), whose sum is σ = 31434480. Its totient is φ = 25907200.

The previous prime is 28597207. The next prime is 28597237. The reversal of 28597213 is 31279582.

It can be written as a sum of positive squares in 8 ways, for example, as 4173849 + 24423364 = 2043^2 + 4942^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28597213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28597253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61803 + ... + 62263.

It is an arithmetic number, because the mean of its divisors is an integer number (1964655).

Almost surely, 2^28597213 is an apocalyptic number.

It is an amenable number.

28597213 is a deficient number, since it is larger than the sum of its proper divisors (2837267).

28597213 is a wasteful number, since it uses less digits than its factorization.

28597213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608.

The product of its digits is 30240, while the sum is 37.

The square root of 28597213 is about 5347.6362067740. The cubic root of 28597213 is about 305.8026444684.

The spelling of 28597213 in words is "twenty-eight million, five hundred ninety-seven thousand, two hundred thirteen".