27721320 has 64 divisors (see below), whose sum is σ = 90728640. Its totient is φ = 6720000.

The previous prime is 27721261. The next prime is 27721321. The reversal of 27721320 is 2312772.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (27721321) 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, 9181 + ... + 11820.

It is an arithmetic number, because the mean of its divisors is an integer number (1417635).

Almost surely, 2^27721320 is an apocalyptic number.

27721320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27721320 is an abundant number, since it is smaller than the sum of its proper divisors (63007320).

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

27721320 is a wasteful number, since it uses less digits than its factorization.

27721320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21026 (or 21022 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 24.

The square root of 27721320 is about 5265.1039875771. The cubic root of 27721320 is about 302.6481117914.

The spelling of 27721320 in words is "twenty-seven million, seven hundred twenty-one thousand, three hundred twenty".