28897713 has 24 divisors (see below), whose sum is σ = 45700200. Its totient is φ = 17487360.

The previous prime is 28897709. The next prime is 28897721. The reversal of 28897713 is 31779882.

It can be written as a sum of positive squares in 4 ways, for example, as 1617984 + 27279729 = 1272^2 + 5223^2 .

It is not a de Polignac number, because 28897713 - 2² = 28897709 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28897793) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5113 + ... + 9161.

It is an arithmetic number, because the mean of its divisors is an integer number (1904175).

Almost surely, 2^28897713 is an apocalyptic number.

It is an amenable number.

28897713 is a deficient number, since it is larger than the sum of its proper divisors (16802487).

28897713 is a wasteful number, since it uses less digits than its factorization.

28897713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129 (or 4126 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 28897713 is about 5375.6593084012. The cubic root of 28897713 is about 306.8700408743.

The spelling of 28897713 in words is "twenty-eight million, eight hundred ninety-seven thousand, seven hundred thirteen".