28858813 has 4 divisors (see below), whose sum is σ = 30113568. Its totient is φ = 27604060.

The previous prime is 28858807. The next prime is 28858867. The reversal of 28858813 is 31885882.

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 a de Polignac number, because none of the positive numbers 2^k-28858813 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 28858813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28858883) 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, 627343 + ... + 627388.

It is an arithmetic number, because the mean of its divisors is an integer number (7528392).

Almost surely, 2^28858813 is an apocalyptic number.

28858813 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28858813 is a deficient number, since it is larger than the sum of its proper divisors (1254755).

28858813 is a wasteful number, since it uses less digits than its factorization.

28858813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254754.

The product of its digits is 122880, while the sum is 43.

The square root of 28858813 is about 5372.0399291145. The cubic root of 28858813 is about 306.7322836643.

The spelling of 28858813 in words is "twenty-eight million, eight hundred fifty-eight thousand, eight hundred thirteen".