27780502820 has 48 divisors (see below), whose sum is σ = 67803281280. Its totient is φ = 9363304704.

The previous prime is 27780502811. The next prime is 27780502877. The reversal of 27780502820 is 2820508772.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1673369 + ... + 1689888.

It is an arithmetic number, because the mean of its divisors is an integer number (1412568360).

Almost surely, 2^27780502820 is an apocalyptic number.

27780502820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27780502820 is an abundant number, since it is smaller than the sum of its proper divisors (40022778460).

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

27780502820 is a wasteful number, since it uses less digits than its factorization.

27780502820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3363332 (or 3363330 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 41.

The spelling of 27780502820 in words is "twenty-seven billion, seven hundred eighty million, five hundred two thousand, eight hundred twenty".