77729713 has 4 divisors (see below), whose sum is σ = 77791860. Its totient is φ = 77667568.

The previous prime is 77729693. The next prime is 77729737. The reversal of 77729713 is 31792777.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31792777 = 2297 ⋅13841.

It can be written as a sum of positive squares in 2 ways, for example, as 54420129 + 23309584 = 7377^2 + 4828^2 .

It is a cyclic number.

It is not a de Polignac number, because 77729713 - 2²⁵ = 44175281 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77729713.

It is not an unprimeable number, because it can be changed into a prime (77729783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29158 + ... + 31711.

It is an arithmetic number, because the mean of its divisors is an integer number (19447965).

Almost surely, 2^77729713 is an apocalyptic number.

It is an amenable number.

77729713 is a deficient number, since it is larger than the sum of its proper divisors (62147).

77729713 is a wasteful number, since it uses less digits than its factorization.

77729713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62146.

The product of its digits is 129654, while the sum is 43.

The square root of 77729713 is about 8816.4455989928. The cubic root of 77729713 is about 426.7717738964.

The spelling of 77729713 in words is "seventy-seven million, seven hundred twenty-nine thousand, seven hundred thirteen".