27791840 has 24 divisors (see below), whose sum is σ = 65658600. Its totient is φ = 11116672.

The previous prime is 27791833. The next prime is 27791849. The reversal of 27791840 is 4819772.

It is a junction number, because it is equal to n+sod(n) for n = 27791794 and 27791803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27791849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86690 + ... + 87009.

It is an arithmetic number, because the mean of its divisors is an integer number (2735775).

Almost surely, 2^27791840 is an apocalyptic number.

27791840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27791840 is an abundant number, since it is smaller than the sum of its proper divisors (37866760).

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

27791840 is a wasteful number, since it uses less digits than its factorization.

27791840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173714 (or 173706 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 27791840 is about 5271.7966576870. The cubic root of 27791840 is about 302.9045290244.

The spelling of 27791840 in words is "twenty-seven million, seven hundred ninety-one thousand, eight hundred forty".