27811992 has 48 divisors (see below), whose sum is σ = 75300840. Its totient is φ = 8556288.

The previous prime is 27811969. The next prime is 27811997. The reversal of 27811992 is 29911872.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 27811992.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27811997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 628 + ... + 7484.

Almost surely, 2^27811992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27811992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37650420).

27811992 is an abundant number, since it is smaller than the sum of its proper divisors (47488848).

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

27811992 is a wasteful number, since it uses less digits than its factorization.

27811992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6892 (or 6875 counting only the distinct ones).

The product of its digits is 18144, while the sum is 39.

The square root of 27811992 is about 5273.7076141933. The cubic root of 27811992 is about 302.9777238577.

The spelling of 27811992 in words is "twenty-seven million, eight hundred eleven thousand, nine hundred ninety-two".