28178680 has 64 divisors (see below), whose sum is σ = 67003200. Its totient is φ = 10644480.

The previous prime is 28178641. The next prime is 28178681. The reversal of 28178680 is 8687182.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28178681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100140 + ... + 100420.

It is an arithmetic number, because the mean of its divisors is an integer number (1046925).

Almost surely, 2^28178680 is an apocalyptic number.

28178680 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 28178680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33501600).

28178680 is an abundant number, since it is smaller than the sum of its proper divisors (38824520).

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

28178680 is a wasteful number, since it uses less digits than its factorization.

28178680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 28178680 is about 5308.3594452524. The cubic root of 28178680 is about 304.3034539156.

It can be divided in two parts, 281 and 78680, that added together give a square (78961 = 281²).

The spelling of 28178680 in words is "twenty-eight million, one hundred seventy-eight thousand, six hundred eighty".