27405820 has 24 divisors (see below), whose sum is σ = 61979904. Its totient is φ = 10118976.

The previous prime is 27405799. The next prime is 27405821. The reversal of 27405820 is 2850472.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27405821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52444 + ... + 52963.

It is an arithmetic number, because the mean of its divisors is an integer number (2582496).

Almost surely, 2^27405820 is an apocalyptic number.

27405820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27405820 is an abundant number, since it is smaller than the sum of its proper divisors (34574084).

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

27405820 is a wasteful number, since it uses less digits than its factorization.

27405820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105429 (or 105427 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 27405820 is about 5235.0568287269. The cubic root of 27405820 is about 301.4955688931.

The spelling of 27405820 in words is "twenty-seven million, four hundred five thousand, eight hundred twenty".