77699243 has 2 divisors, whose sum is σ = 77699244. Its totient is φ = 77699242.

The previous prime is 77699239. The next prime is 77699261. The reversal of 77699243 is 34299677.

It is a weak prime.

It is an emirp because it is prime and its reverse (34299677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77699243 - 2² = 77699239 is a prime.

It is not a weakly prime, because it can be changed into another prime (77699213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38849621 + 38849622.

It is an arithmetic number, because the mean of its divisors is an integer number (38849622).

Almost surely, 2^77699243 is an apocalyptic number.

77699243 is a deficient number, since it is larger than the sum of its proper divisors (1).

77699243 is an equidigital number, since it uses as much as digits as its factorization.

77699243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 47.

The square root of 77699243 is about 8814.7174089701. The cubic root of 77699243 is about 426.7160018500.

The spelling of 77699243 in words is "seventy-seven million, six hundred ninety-nine thousand, two hundred forty-three".