27798820 has 96 divisors (see below), whose sum is σ = 71124480. Its totient is φ = 8924160.

The previous prime is 27798817. The next prime is 27798821. The reversal of 27798820 is 2889772.

It is not an unprimeable number, because it can be changed into a prime (27798821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166377 + ... + 166543.

It is an arithmetic number, because the mean of its divisors is an integer number (740880).

Almost surely, 2^27798820 is an apocalyptic number.

27798820 is a gapful number since it is divisible by the number (20) 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 27798820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35562240).

27798820 is an abundant number, since it is smaller than the sum of its proper divisors (43325660).

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

27798820 is a wasteful number, since it uses less digits than its factorization.

27798820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 27798820 is about 5272.4586295200. The cubic root of 27798820 is about 302.9298853476.

The spelling of 27798820 in words is "twenty-seven million, seven hundred ninety-eight thousand, eight hundred twenty".