28179380 has 18 divisors (see below), whose sum is σ = 59226594. Its totient is φ = 11262256.

The previous prime is 28179343. The next prime is 28179383. The reversal of 28179380 is 8397182.

It can be written as a sum of positive squares in only one way, i.e., 22543504 + 5635876 = 4748^2 + 2374^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28179383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23147 + ... + 24333.

Almost surely, 2^28179380 is an apocalyptic number.

28179380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28179380 is an abundant number, since it is smaller than the sum of its proper divisors (31047214).

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

28179380 is an equidigital number, since it uses as much as digits as its factorization.

28179380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2383 (or 1194 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28179380 is about 5308.4253785845. The cubic root of 28179380 is about 304.3059736770.

The spelling of 28179380 in words is "twenty-eight million, one hundred seventy-nine thousand, three hundred eighty".