27945640800 has 1296 divisors, whose sum is σ = 131982177600. Its totient is φ = 5486745600.

The previous prime is 27945640783. The next prime is 27945640847. The reversal of 27945640800 is 804654972.

It is a happy number.

27945640800 is a `hidden beast` number, since 2 + 7 + 9 + 4 + 564 + 0 + 80 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 215 ways as a sum of consecutive naturals, for example, 73735011 + ... + 73735389.

It is an arithmetic number, because the mean of its divisors is an integer number (101838100).

Almost surely, 2^27945640800 is an apocalyptic number.

27945640800 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 27945640800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65991088800).

27945640800 is an abundant number, since it is smaller than the sum of its proper divisors (104036536800).

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

27945640800 is a wasteful number, since it uses less digits than its factorization.

27945640800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449 (or 426 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 27945640800 in words is "twenty-seven billion, nine hundred forty-five million, six hundred forty thousand, eight hundred".