77729449039 has 4 divisors (see below), whose sum is σ = 84795762600. Its totient is φ = 70663135480.

The previous prime is 77729449033. The next prime is 77729449067. The reversal of 77729449039 is 93094492777.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77729449039 - 2²¹ = 77727351887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77729449033) 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, 3533156764 + ... + 3533156785.

It is an arithmetic number, because the mean of its divisors is an integer number (21198940650).

Almost surely, 2^77729449039 is an apocalyptic number.

77729449039 is a deficient number, since it is larger than the sum of its proper divisors (7066313561).

77729449039 is a wasteful number, since it uses less digits than its factorization.

77729449039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7066313560.

The product of its (nonzero) digits is 24004512, while the sum is 61.

The spelling of 77729449039 in words is "seventy-seven billion, seven hundred twenty-nine million, four hundred forty-nine thousand, thirty-nine".