28713860 has 48 divisors (see below), whose sum is σ = 69237504. Its totient is φ = 9798528.

The previous prime is 28713847. The next prime is 28713869. The reversal of 28713860 is 6831782.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 28713860.

It is not an unprimeable number, because it can be changed into a prime (28713869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44057 + ... + 44703.

It is an arithmetic number, because the mean of its divisors is an integer number (1442448).

Almost surely, 2^28713860 is an apocalyptic number.

28713860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28713860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34618752).

28713860 is an abundant number, since it is smaller than the sum of its proper divisors (40523644).

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

28713860 is a wasteful number, since it uses less digits than its factorization.

28713860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980 (or 978 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 28713860 is about 5358.5315152568. The cubic root of 28713860 is about 306.2178664049.

The spelling of 28713860 in words is "twenty-eight million, seven hundred thirteen thousand, eight hundred sixty".