27731320 has 16 divisors (see below), whose sum is σ = 62395560. Its totient is φ = 11092512.

The previous prime is 27731311. The next prime is 27731321. The reversal of 27731320 is 2313772.

It is a super-2 number, since 2×27731320² = 1538052217884800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27731321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346602 + ... + 346681.

Almost surely, 2^27731320 is an apocalyptic number.

27731320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27731320 is an abundant number, since it is smaller than the sum of its proper divisors (34664240).

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

27731320 is a wasteful number, since it uses less digits than its factorization.

27731320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693294 (or 693290 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 27731320 is about 5266.0535508101. The cubic root of 27731320 is about 302.6844991553.

The spelling of 27731320 in words is "twenty-seven million, seven hundred thirty-one thousand, three hundred twenty".