27808140 has 48 divisors (see below), whose sum is σ = 78140160. Its totient is φ = 7389120.

The previous prime is 27808133. The next prime is 27808159. The reversal of 27808140 is 4180872.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 27808098 and 27808107.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20895 + ... + 22185.

It is an arithmetic number, because the mean of its divisors is an integer number (1627920).

Almost surely, 2^27808140 is an apocalyptic number.

27808140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27808140 is an abundant number, since it is smaller than the sum of its proper divisors (50332020).

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

27808140 is a wasteful number, since it uses less digits than its factorization.

27808140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1662 (or 1660 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 27808140 is about 5273.3423935868. The cubic root of 27808140 is about 302.9637355982.

The spelling of 27808140 in words is "twenty-seven million, eight hundred eight thousand, one hundred forty".