27765840 has 80 divisors (see below), whose sum is σ = 90619200. Its totient is φ = 7013376.

The previous prime is 27765833. The next prime is 27765841. The reversal of 27765840 is 4856772.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27765841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1516 + ... + 7604.

It is an arithmetic number, because the mean of its divisors is an integer number (1132740).

Almost surely, 2^27765840 is an apocalyptic number.

27765840 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 27765840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45309600).

27765840 is an abundant number, since it is smaller than the sum of its proper divisors (62853360).

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

27765840 is a wasteful number, since it uses less digits than its factorization.

27765840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6124 (or 6118 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 27765840 is about 5269.3301282042. The cubic root of 27765840 is about 302.8100411585.

The spelling of 27765840 in words is "twenty-seven million, seven hundred sixty-five thousand, eight hundred forty".