28130913 has 12 divisors (see below), whose sum is σ = 40704768. Its totient is φ = 18721080.

The previous prime is 28130911. The next prime is 28130929. The reversal of 28130913 is 31903182.

It is not a de Polignac number, because 28130913 - 2¹ = 28130911 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28130911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3408 + ... + 8238.

It is an arithmetic number, because the mean of its divisors is an integer number (3392064).

Almost surely, 2^28130913 is an apocalyptic number.

It is an amenable number.

28130913 is a deficient number, since it is larger than the sum of its proper divisors (12573855).

28130913 is a wasteful number, since it uses less digits than its factorization.

28130913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5484 (or 5481 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 28130913 is about 5303.8583125872. The cubic root of 28130913 is about 304.1314103211.

The spelling of 28130913 in words is "twenty-eight million, one hundred thirty thousand, nine hundred thirteen".