28878713 has 4 divisors (see below), whose sum is σ = 29006160. Its totient is φ = 28751268.

The previous prime is 28878683. The next prime is 28878749. The reversal of 28878713 is 31787882.

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.

It is a cyclic number.

It is not a de Polignac number, because 28878713 - 2¹⁰ = 28877689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28878313) 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, 63383 + ... + 63836.

It is an arithmetic number, because the mean of its divisors is an integer number (7251540).

Almost surely, 2^28878713 is an apocalyptic number.

It is an amenable number.

28878713 is a deficient number, since it is larger than the sum of its proper divisors (127447).

28878713 is a wasteful number, since it uses less digits than its factorization.

28878713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127446.

The product of its digits is 150528, while the sum is 44.

The square root of 28878713 is about 5373.8917927327. The cubic root of 28878713 is about 306.8027713169.

The spelling of 28878713 in words is "twenty-eight million, eight hundred seventy-eight thousand, seven hundred thirteen".