77830427 has 2 divisors, whose sum is σ = 77830428. Its totient is φ = 77830426.

The previous prime is 77830421. The next prime is 77830481. The reversal of 77830427 is 72403877.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77830427 is a prime.

It is not a weakly prime, because it can be changed into another prime (77830421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38915213 + 38915214.

It is an arithmetic number, because the mean of its divisors is an integer number (38915214).

Almost surely, 2^77830427 is an apocalyptic number.

77830427 is a deficient number, since it is larger than the sum of its proper divisors (1).

77830427 is an equidigital number, since it uses as much as digits as its factorization.

77830427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65856, while the sum is 38.

The square root of 77830427 is about 8822.1554622439. The cubic root of 77830427 is about 426.9560163622.

The spelling of 77830427 in words is "seventy-seven million, eight hundred thirty thousand, four hundred twenty-seven".