77616439 has 2 divisors, whose sum is σ = 77616440. Its totient is φ = 77616438.

The previous prime is 77616401. The next prime is 77616443. The reversal of 77616439 is 93461677.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77616439 - 2⁹ = 77615927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77616395 and 77616404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77616449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38808219 + 38808220.

It is an arithmetic number, because the mean of its divisors is an integer number (38808220).

Almost surely, 2^77616439 is an apocalyptic number.

77616439 is a deficient number, since it is larger than the sum of its proper divisors (1).

77616439 is an equidigital number, since it uses as much as digits as its factorization.

77616439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 43.

The square root of 77616439 is about 8810.0192394796. The cubic root of 77616439 is about 426.5643643753.

The spelling of 77616439 in words is "seventy-seven million, six hundred sixteen thousand, four hundred thirty-nine".