27909871650 has 96 divisors (see below), whose sum is σ = 76976412480. Its totient is φ = 7435935360.

The previous prime is 27909871621. The next prime is 27909871651. The reversal of 27909871650 is 5617890972.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (27909871651) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 1593742 + ... + 1611158.

It is an arithmetic number, because the mean of its divisors is an integer number (801837630).

Almost surely, 2^27909871650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27909871650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38488206240).

27909871650 is an abundant number, since it is smaller than the sum of its proper divisors (49066540830).

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

27909871650 is a wasteful number, since it uses less digits than its factorization.

27909871650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18625 (or 18614 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The spelling of 27909871650 in words is "twenty-seven billion, nine hundred nine million, eight hundred seventy-one thousand, six hundred fifty".