27820884389 has 16 divisors (see below), whose sum is σ = 28895711040. Its totient is φ = 26754000000.

The previous prime is 27820884383. The next prime is 27820884397. The reversal of 27820884389 is 98348802872.

It is a cyclic number.

It is not a de Polignac number, because 27820884389 - 2²⁸ = 27552448933 is a prime.

It is a super-2 number, since 2×27820884389² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27820884383) 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, 8556014 + ... + 8559264.

It is an arithmetic number, because the mean of its divisors is an integer number (1805981940).

Almost surely, 2^27820884389 is an apocalyptic number.

27820884389 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

27820884389 is a deficient number, since it is larger than the sum of its proper divisors (1074826651).

27820884389 is a wasteful number, since it uses less digits than its factorization.

27820884389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4372.

The product of its (nonzero) digits is 12386304, while the sum is 59.

The spelling of 27820884389 in words is "twenty-seven billion, eight hundred twenty million, eight hundred eighty-four thousand, three hundred eighty-nine".