27991516 has 24 divisors (see below), whose sum is σ = 56095200. Its totient is φ = 11972352.

The previous prime is 27991511. The next prime is 27991519. The reversal of 27991516 is 61519972.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27991511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26160 + ... + 27208.

It is an arithmetic number, because the mean of its divisors is an integer number (2337300).

Almost surely, 2^27991516 is an apocalyptic number.

It is an amenable number.

27991516 is an abundant number, since it is smaller than the sum of its proper divisors (28103684).

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

27991516 is a wasteful number, since it uses less digits than its factorization.

27991516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013 (or 2011 counting only the distinct ones).

The product of its digits is 34020, while the sum is 40.

The square root of 27991516 is about 5290.7008987468. The cubic root of 27991516 is about 303.6282245408.

The spelling of 27991516 in words is "twenty-seven million, nine hundred ninety-one thousand, five hundred sixteen".