28717930 has 48 divisors (see below), whose sum is σ = 57912480. Its totient is φ = 10222848.

The previous prime is 28717921. The next prime is 28717939. The reversal of 28717930 is 3971782.

It is an interprime number because it is at equal distance from previous prime (28717921) and next prime (28717939).

It is a self number, because there is not a number n which added to its sum of digits gives 28717930.

It is not an unprimeable number, because it can be changed into a prime (28717939) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54649 + ... + 55171.

It is an arithmetic number, because the mean of its divisors is an integer number (1206510).

Almost surely, 2^28717930 is an apocalyptic number.

28717930 is an abundant number, since it is smaller than the sum of its proper divisors (29194550).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28717930 is a wasteful number, since it uses less digits than its factorization.

28717930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 566 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 28717930 is about 5358.9112700249. The cubic root of 28717930 is about 306.2323338414.

It can be divided in two parts, 2871 and 7930, that added together give a palindrome (10801).

The spelling of 28717930 in words is "twenty-eight million, seven hundred seventeen thousand, nine hundred thirty".