27163856640 has 432 divisors, whose sum is σ = 95135723424. Its totient is φ = 6582435840.

The previous prime is 27163856611. The next prime is 27163856647. The reversal of 27163856640 is 4665836172.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 27163856640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27163856647) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 62733864 + ... + 62734296.

It is an arithmetic number, because the mean of its divisors is an integer number (220221582).

Almost surely, 2^27163856640 is an apocalyptic number.

27163856640 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 27163856640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47567861712).

27163856640 is an abundant number, since it is smaller than the sum of its proper divisors (67971866784).

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

27163856640 is a wasteful number, since it uses less digits than its factorization.

27163856640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536 (or 491 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 27163856640 in words is "twenty-seven billion, one hundred sixty-three million, eight hundred fifty-six thousand, six hundred forty".