27491990400 has 1152 divisors, whose sum is σ = 119332362240. Its totient is φ = 5894553600.

The previous prime is 27491990377. The next prime is 27491990411. The reversal of 27491990400 is 409919472.

It is a happy number.

27491990400 is a `hidden beast` number, since 2 + 74 + 91 + 9 + 90 + 400 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

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 (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 331228759 + ... + 331228841.

It is an arithmetic number, because the mean of its divisors is an integer number (103587120).

Almost surely, 2^27491990400 is an apocalyptic number.

27491990400 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 27491990400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59666181120).

27491990400 is an abundant number, since it is smaller than the sum of its proper divisors (91840371840).

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

27491990400 is a wasteful number, since it uses less digits than its factorization.

27491990400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 27491990400 in words is "twenty-seven billion, four hundred ninety-one million, nine hundred ninety thousand, four hundred".