27639442860 has 96 divisors (see below), whose sum is σ = 82091620800. Its totient is φ = 6924361728.

The previous prime is 27639442849. The next prime is 27639442903. The reversal of 27639442860 is 6824493672.

It is a super-2 number, since 2×27639442860² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 543816 + ... + 592464.

It is an arithmetic number, because the mean of its divisors is an integer number (855121050).

Almost surely, 2^27639442860 is an apocalyptic number.

27639442860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27639442860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41045810400).

27639442860 is an abundant number, since it is smaller than the sum of its proper divisors (54452177940).

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

27639442860 is a wasteful number, since it uses less digits than its factorization.

27639442860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49235 (or 49233 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 51.

The spelling of 27639442860 in words is "twenty-seven billion, six hundred thirty-nine million, four hundred forty-two thousand, eight hundred sixty".