27738278479 has 2 divisors, whose sum is σ = 27738278480. Its totient is φ = 27738278478.

The previous prime is 27738278473. The next prime is 27738278597. The reversal of 27738278479 is 97487283772.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 27738278479 - 2²¹ = 27736181327 is a prime.

It is a super-5 number, since 5×27738278479⁵ (a number of 53 digits) contains 55555 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 27738278479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27738278473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13869139239 + 13869139240.

It is an arithmetic number, because the mean of its divisors is an integer number (13869139240).

Almost surely, 2^27738278479 is an apocalyptic number.

27738278479 is a deficient number, since it is larger than the sum of its proper divisors (1).

27738278479 is an equidigital number, since it uses as much as digits as its factorization.

27738278479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66382848, while the sum is 64.

The spelling of 27738278479 in words is "twenty-seven billion, seven hundred thirty-eight million, two hundred seventy-eight thousand, four hundred seventy-nine".