27405420 has 96 divisors (see below), whose sum is σ = 91542528. Its totient is φ = 5989632.

The previous prime is 27405407. The next prime is 27405431. The reversal of 27405420 is 2450472.

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 31 ways as a sum of consecutive naturals, for example, 8242 + ... + 11078.

It is an arithmetic number, because the mean of its divisors is an integer number (953568).

Almost surely, 2^27405420 is an apocalyptic number.

27405420 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 27405420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45771264).

27405420 is an abundant number, since it is smaller than the sum of its proper divisors (64137108).

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

27405420 is a wasteful number, since it uses less digits than its factorization.

27405420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2879 (or 2877 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 27405420 is about 5235.0186246087. The cubic root of 27405420 is about 301.4941020658.

Adding to 27405420 its reverse (2450472), we get a palindrome (29855892).

The spelling of 27405420 in words is "twenty-seven million, four hundred five thousand, four hundred twenty".