27781528020 has 48 divisors (see below), whose sum is σ = 77984285568. Its totient is φ = 7389740160.

The previous prime is 27781528007. The next prime is 27781528037. The reversal of 27781528020 is 2082518772.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559336 + ... + 606975.

It is an arithmetic number, because the mean of its divisors is an integer number (1624672616).

Almost surely, 2^27781528020 is an apocalyptic number.

27781528020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27781528020 is an abundant number, since it is smaller than the sum of its proper divisors (50202757548).

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

27781528020 is a wasteful number, since it uses less digits than its factorization.

27781528020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166720 (or 1166718 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 42.

The spelling of 27781528020 in words is "twenty-seven billion, seven hundred eighty-one million, five hundred twenty-eight thousand, twenty".