28344680 has 96 divisors (see below), whose sum is σ = 79056000. Its totient is φ = 8955648.

The previous prime is 28344649. The next prime is 28344689. The reversal of 28344680 is 8644382.

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 28344680.

It is not an unprimeable number, because it can be changed into a prime (28344689) 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, 47021 + ... + 47619.

It is an arithmetic number, because the mean of its divisors is an integer number (823500).

Almost surely, 2^28344680 is an apocalyptic number.

28344680 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 28344680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39528000).

28344680 is an abundant number, since it is smaller than the sum of its proper divisors (50711320).

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

28344680 is a wasteful number, since it uses less digits than its factorization.

28344680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 28344680 is about 5323.9722012798. The cubic root of 28344680 is about 304.8998327345.

The spelling of 28344680 in words is "twenty-eight million, three hundred forty-four thousand, six hundred eighty".