27993420 has 144 divisors (see below), whose sum is σ = 104569920. Its totient is φ = 5902848.

The previous prime is 27993419. The next prime is 27993451. The reversal of 27993420 is 2439972.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15526 + ... + 17234.

It is an arithmetic number, because the mean of its divisors is an integer number (726180).

Almost surely, 2^27993420 is an apocalyptic number.

27993420 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 27993420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52284960).

27993420 is an abundant number, since it is smaller than the sum of its proper divisors (76576500).

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

27993420 is a wasteful number, since it uses less digits than its factorization.

27993420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744 (or 1739 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 27993420 is about 5290.8808340389. The cubic root of 27993420 is about 303.6351087104.

The spelling of 27993420 in words is "twenty-seven million, nine hundred ninety-three thousand, four hundred twenty".