77656387 has 2 divisors, whose sum is σ = 77656388. Its totient is φ = 77656386.

The previous prime is 77656351. The next prime is 77656393. The reversal of 77656387 is 78365677.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77656387 - 2⁷ = 77656259 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77656387.

It is not a weakly prime, because it can be changed into another prime (77656307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38828193 + 38828194.

It is an arithmetic number, because the mean of its divisors is an integer number (38828194).

Almost surely, 2^77656387 is an apocalyptic number.

77656387 is a deficient number, since it is larger than the sum of its proper divisors (1).

77656387 is an equidigital number, since it uses as much as digits as its factorization.

77656387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1481760, while the sum is 49.

The square root of 77656387 is about 8812.2861392490. The cubic root of 77656387 is about 426.6375338860.

The spelling of 77656387 in words is "seventy-seven million, six hundred fifty-six thousand, three hundred eighty-seven".