27845840 has 40 divisors (see below), whose sum is σ = 70629408. Its totient is φ = 10125440.

The previous prime is 27845837. The next prime is 27845869. The reversal of 27845840 is 4854872.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 27845794 and 27845803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14942 + ... + 16701.

Almost surely, 2^27845840 is an apocalyptic number.

27845840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27845840 is an abundant number, since it is smaller than the sum of its proper divisors (42783568).

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

27845840 is a wasteful number, since it uses less digits than its factorization.

27845840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31667 (or 31661 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 38.

The square root of 27845840 is about 5276.9157658617. The cubic root of 27845840 is about 303.1005849184.

The spelling of 27845840 in words is "twenty-seven million, eight hundred forty-five thousand, eight hundred forty".