27493778389401 has 27 divisors (see below), whose sum is σ = 39918347238549. Its totient is φ = 18235002726072.

The previous prime is 27493778389381. The next prime is 27493778389409. The reversal of 27493778389401 is 10498387739472.

The square root of 27493778389401 is 5243451.

It is a perfect power (a square), and thus also a powerful number.

27493778389401 is a `hidden beast` number, since 2 + 7 + 49 + 37 + 78 + 3 + 89 + 401 = 666.

It is not a de Polignac number, because 27493778389401 - 2¹⁷ = 27493778258329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27493778389401.

It is not an unprimeable number, because it can be changed into a prime (27493778389409) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3130335856 + ... + 3130344638.

Almost surely, 2^{27493778389401} is an apocalyptic number.

27493778389401 is the 5243451-st square number.

27493778389401 is the 2621726-th centered octagonal number.

It is an amenable number.

27493778389401 is a deficient number, since it is larger than the sum of its proper divisors (12424568849148).

27493778389401 is an frugal number, since it uses more digits than its factorization.

27493778389401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17970 (or 8985 counting only the distinct ones).

The product of its (nonzero) digits is 512096256, while the sum is 72.

The spelling of 27493778389401 in words is "twenty-seven trillion, four hundred ninety-three billion, seven hundred seventy-eight million, three hundred eighty-nine thousand, four hundred one".