27685840 has 80 divisors (see below), whose sum is σ = 79244928. Its totient is φ = 8759808.

The previous prime is 27685799. The next prime is 27685849. The reversal of 27685840 is 4858672.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 27685793 and 27685802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27685849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5379 + ... + 9181.

Almost surely, 2^27685840 is an apocalyptic number.

27685840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27685840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39622464).

27685840 is an abundant number, since it is smaller than the sum of its proper divisors (51559088).

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

27685840 is a wasteful number, since it uses less digits than its factorization.

27685840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3836 (or 3830 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 27685840 is about 5261.7335546377. The cubic root of 27685840 is about 302.5189387774.

The spelling of 27685840 in words is "twenty-seven million, six hundred eighty-five thousand, eight hundred forty".