77329939 has 4 divisors (see below), whose sum is σ = 77347656. Its totient is φ = 77312224.

The previous prime is 77329927. The next prime is 77329951. The reversal of 77329939 is 93992377.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 93992377 = 41 ⋅2292497.

It is an interprime number because it is at equal distance from previous prime (77329927) and next prime (77329951).

It is a cyclic number.

It is not a de Polignac number, because 77329939 - 2⁵ = 77329907 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77329892 and 77329901.

It is not an unprimeable number, because it can be changed into a prime (77329339) 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, 2832 + ... + 12754.

It is an arithmetic number, because the mean of its divisors is an integer number (19336914).

It is a vampire number, since it can be written as 7793 ⋅ 9923 (with its own digits).

Almost surely, 2^77329939 is an apocalyptic number.

77329939 is a deficient number, since it is larger than the sum of its proper divisors (17717).

77329939 is an equidigital number, since it uses as much as digits as its factorization.

77329939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17716.

The product of its digits is 642978, while the sum is 49.

The square root of 77329939 is about 8793.7443105881. The cubic root of 77329939 is about 426.0388684439.

It can be divided in two parts, 7732 and 9939, that added together give a palindrome (17671).

The spelling of 77329939 in words is "seventy-seven million, three hundred twenty-nine thousand, nine hundred thirty-nine".