79780427 has 2 divisors, whose sum is σ = 79780428. Its totient is φ = 79780426.

The previous prime is 79780417. The next prime is 79780429. The reversal of 79780427 is 72408797.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79780427 - 2¹² = 79776331 is a prime.

Together with 79780429, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79780429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39890213 + 39890214.

It is an arithmetic number, because the mean of its divisors is an integer number (39890214).

Almost surely, 2^79780427 is an apocalyptic number.

79780427 is a deficient number, since it is larger than the sum of its proper divisors (1).

79780427 is an equidigital number, since it uses as much as digits as its factorization.

79780427 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 79780427 is about 8931.9889722279. The cubic root of 79780427 is about 430.4923637213.

The spelling of 79780427 in words is "seventy-nine million, seven hundred eighty thousand, four hundred twenty-seven".