27804974381 has 2 divisors, whose sum is σ = 27804974382. Its totient is φ = 27804974380.

The previous prime is 27804974333. The next prime is 27804974389. The reversal of 27804974381 is 18347940872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24949782025 + 2855192356 = 157955^2 + 53434^2 .

It is a cyclic number.

It is not a de Polignac number, because 27804974381 - 2⁶ = 27804974317 is a prime.

It is a super-2 number, since 2×27804974381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27804974389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13902487190 + 13902487191.

It is an arithmetic number, because the mean of its divisors is an integer number (13902487191).

Almost surely, 2^27804974381 is an apocalyptic number.

It is an amenable number.

27804974381 is a deficient number, since it is larger than the sum of its proper divisors (1).

27804974381 is an equidigital number, since it uses as much as digits as its factorization.

27804974381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 27804974381 in words is "twenty-seven billion, eight hundred four million, nine hundred seventy-four thousand, three hundred eighty-one".