27747725820 has 24 divisors (see below), whose sum is σ = 77693632464. Its totient is φ = 7399393536.

The previous prime is 27747725779. The next prime is 27747725821. The reversal of 27747725820 is 2852774772.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27747725821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231230989 + ... + 231231108.

It is an arithmetic number, because the mean of its divisors is an integer number (3237234686).

Almost surely, 2^27747725820 is an apocalyptic number.

27747725820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27747725820 is an abundant number, since it is smaller than the sum of its proper divisors (49945906644).

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

27747725820 is a wasteful number, since it uses less digits than its factorization.

27747725820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462462109 (or 462462107 counting only the distinct ones).

The product of its (nonzero) digits is 3073280, while the sum is 51.

The spelling of 27747725820 in words is "twenty-seven billion, seven hundred forty-seven million, seven hundred twenty-five thousand, eight hundred twenty".