27770881536 has 320 divisors, whose sum is σ = 90312076800. Its totient is φ = 8386633728.

The previous prime is 27770881531. The next prime is 27770881561. The reversal of 27770881536 is 63518807772.

27770881536 is a `hidden beast` number, since 27 + 7 + 7 + 0 + 8 + 81 + 536 = 666.

It is a super-2 number, since 2×27770881536² (a number of 22 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27770881531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6038790 + ... + 6043386.

It is an arithmetic number, because the mean of its divisors is an integer number (282225240).

Almost surely, 2^27770881536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27770881536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45156038400).

27770881536 is an abundant number, since it is smaller than the sum of its proper divisors (62541195264).

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

27770881536 is a wasteful number, since it uses less digits than its factorization.

27770881536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4666 (or 4644 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 54.

The spelling of 27770881536 in words is "twenty-seven billion, seven hundred seventy million, eight hundred eighty-one thousand, five hundred thirty-six".