28180340 has 12 divisors (see below), whose sum is σ = 59178756. Its totient is φ = 11272128.

The previous prime is 28180319. The next prime is 28180357. The reversal of 28180340 is 4308182.

It can be written as a sum of positive squares in 2 ways, for example, as 10523536 + 17656804 = 3244^2 + 4202^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 704489 + ... + 704528.

It is an arithmetic number, because the mean of its divisors is an integer number (4931563).

Almost surely, 2^28180340 is an apocalyptic number.

28180340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28180340 is an abundant number, since it is smaller than the sum of its proper divisors (30998416).

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

28180340 is a wasteful number, since it uses less digits than its factorization.

28180340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1409026 (or 1409024 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 28180340 is about 5308.5158001084. The cubic root of 28180340 is about 304.3094292820.

The spelling of 28180340 in words is "twenty-eight million, one hundred eighty thousand, three hundred forty".