27780479 has 2 divisors, whose sum is σ = 27780480. Its totient is φ = 27780478.

The previous prime is 27780461. The next prime is 27780491. The reversal of 27780479 is 97408772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 27780479 - 2¹² = 27776383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27780419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13890239 + 13890240.

It is an arithmetic number, because the mean of its divisors is an integer number (13890240).

Almost surely, 2^27780479 is an apocalyptic number.

27780479 is a deficient number, since it is larger than the sum of its proper divisors (1).

27780479 is an equidigital number, since it uses as much as digits as its factorization.

27780479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 44.

The square root of 27780479 is about 5270.7190211583. The cubic root of 27780479 is about 302.8632487135.

The spelling of 27780479 in words is "twenty-seven million, seven hundred eighty thousand, four hundred seventy-nine".