77740427 has 2 divisors, whose sum is σ = 77740428. Its totient is φ = 77740426.

The previous prime is 77740417. The next prime is 77740447. The reversal of 77740427 is 72404777.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77740427 - 2²⁰ = 76691851 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77740417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38870213 + 38870214.

It is an arithmetic number, because the mean of its divisors is an integer number (38870214).

Almost surely, 2^77740427 is an apocalyptic number.

77740427 is a deficient number, since it is larger than the sum of its proper divisors (1).

77740427 is an equidigital number, since it uses as much as digits as its factorization.

77740427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 76832, while the sum is 38.

The square root of 77740427 is about 8817.0531925355. The cubic root of 77740427 is about 426.7913812534.

The spelling of 77740427 in words is "seventy-seven million, seven hundred forty thousand, four hundred twenty-seven".