27917988 has 48 divisors (see below), whose sum is σ = 74941440. Its totient is φ = 7923744.

The previous prime is 27917987. The next prime is 27917993. The reversal of 27917988 is 88971972.

It is a self number, because there is not a number n which added to its sum of digits gives 27917988.

It is not an unprimeable number, because it can be changed into a prime (27917987) 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, 12673 + ... + 14711.

It is an arithmetic number, because the mean of its divisors is an integer number (1561280).

Almost surely, 2^27917988 is an apocalyptic number.

27917988 is a gapful number since it is divisible by the number (28) 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 27917988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37470720).

27917988 is an abundant number, since it is smaller than the sum of its proper divisors (47023452).

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

27917988 is a wasteful number, since it uses less digits than its factorization.

27917988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2216 (or 2214 counting only the distinct ones).

The product of its digits is 508032, while the sum is 51.

The square root of 27917988 is about 5283.7475337113. The cubic root of 27917988 is about 303.3621349566.

The spelling of 27917988 in words is "twenty-seven million, nine hundred seventeen thousand, nine hundred eighty-eight".