27820556988 has 48 divisors (see below), whose sum is σ = 74721911040. Its totient is φ = 7891542144.

The previous prime is 27820556977. The next prime is 27820556989. The reversal of 27820556988 is 88965502872.

It is a super-2 number, since 2×27820556988² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27820556989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1179681 + ... + 1203032.

It is an arithmetic number, because the mean of its divisors is an integer number (1556706480).

Almost surely, 2^27820556988 is an apocalyptic number.

27820556988 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

27820556988 is an abundant number, since it is smaller than the sum of its proper divisors (46901354052).

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

27820556988 is a wasteful number, since it uses less digits than its factorization.

27820556988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382866 (or 2382864 counting only the distinct ones).

The product of its (nonzero) digits is 19353600, while the sum is 60.

The spelling of 27820556988 in words is "twenty-seven billion, eight hundred twenty million, five hundred fifty-six thousand, nine hundred eighty-eight".