28718586 has 96 divisors (see below), whose sum is σ = 71705088. Its totient is φ = 8242560.

The previous prime is 28718579. The next prime is 28718603. The reversal of 28718586 is 68581782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 268345 + ... + 268451.

It is an arithmetic number, because the mean of its divisors is an integer number (746928).

Almost surely, 2^28718586 is an apocalyptic number.

28718586 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 28718586, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35852544).

28718586 is an abundant number, since it is smaller than the sum of its proper divisors (42986502).

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

28718586 is a wasteful number, since it uses less digits than its factorization.

28718586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 193 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 28718586 is about 5358.9724761376. The cubic root of 28718586 is about 306.2346655657.

The spelling of 28718586 in words is "twenty-eight million, seven hundred eighteen thousand, five hundred eighty-six".