77386691 has 2 divisors, whose sum is σ = 77386692. Its totient is φ = 77386690.

The previous prime is 77386637. The next prime is 77386709. The reversal of 77386691 is 19668377.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77386691 - 2¹⁰ = 77385667 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77386291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38693345 + 38693346.

It is an arithmetic number, because the mean of its divisors is an integer number (38693346).

Almost surely, 2^77386691 is an apocalyptic number.

77386691 is a deficient number, since it is larger than the sum of its proper divisors (1).

77386691 is an equidigital number, since it uses as much as digits as its factorization.

77386691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 77386691 is about 8796.9705580956. The cubic root of 77386691 is about 426.1430654546.

The spelling of 77386691 in words is "seventy-seven million, three hundred eighty-six thousand, six hundred ninety-one".