28702913 has 4 divisors (see below), whose sum is σ = 28895700. Its totient is φ = 28510128.

The previous prime is 28702909. The next prime is 28702937. The reversal of 28702913 is 31920782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9193024 + 19509889 = 3032^2 + 4417^2 .

It is a cyclic number.

It is not a de Polignac number, because 28702913 - 2² = 28702909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28702913.

It is not an unprimeable number, because it can be changed into a prime (28702903) 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, 96170 + ... + 96467.

It is an arithmetic number, because the mean of its divisors is an integer number (7223925).

Almost surely, 2^28702913 is an apocalyptic number.

It is an amenable number.

28702913 is a deficient number, since it is larger than the sum of its proper divisors (192787).

28702913 is a wasteful number, since it uses less digits than its factorization.

28702913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192786.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 28702913 is about 5357.5099626599. The cubic root of 28702913 is about 306.1789468370.

The spelling of 28702913 in words is "twenty-eight million, seven hundred two thousand, nine hundred thirteen".