28839913 has 4 divisors (see below), whose sum is σ = 28864080. Its totient is φ = 28815748.

The previous prime is 28839911. The next prime is 28839919. The reversal of 28839913 is 31993882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31993882 = 2 ⋅15996941.

It is a cyclic number.

It is not a de Polignac number, because 28839913 - 2¹ = 28839911 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 28839913.

It is not an unprimeable number, because it can be changed into a prime (28839911) 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, 10195 + ... + 12712.

It is an arithmetic number, because the mean of its divisors is an integer number (7216020).

Almost surely, 2^28839913 is an apocalyptic number.

It is an amenable number.

28839913 is a deficient number, since it is larger than the sum of its proper divisors (24167).

28839913 is a wasteful number, since it uses less digits than its factorization.

28839913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24166.

The product of its digits is 93312, while the sum is 43.

The square root of 28839913 is about 5370.2805327096. The cubic root of 28839913 is about 306.6653080963.

The spelling of 28839913 in words is "twenty-eight million, eight hundred thirty-nine thousand, nine hundred thirteen".