28180280 has 16 divisors (see below), whose sum is σ = 63405720. Its totient is φ = 11272096.

The previous prime is 28180261. The next prime is 28180309. The reversal of 28180280 is 8208182.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 352214 + ... + 352293.

Almost surely, 2^28180280 is an apocalyptic number.

28180280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28180280 is an abundant number, since it is smaller than the sum of its proper divisors (35225440).

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

28180280 is a wasteful number, since it uses less digits than its factorization.

28180280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704518 (or 704514 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 28180280 is about 5308.5101488082. The cubic root of 28180280 is about 304.3092133090.

The spelling of 28180280 in words is "twenty-eight million, one hundred eighty thousand, two hundred eighty".