77106839 has 4 divisors (see below), whose sum is σ = 77131824. Its totient is φ = 77081856.

The previous prime is 77106797. The next prime is 77106847. The reversal of 77106839 is 93860177.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77106839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77106796 and 77106805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77106859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7082 + ... + 14295.

It is an arithmetic number, because the mean of its divisors is an integer number (19282956).

Almost surely, 2^77106839 is an apocalyptic number.

77106839 is a deficient number, since it is larger than the sum of its proper divisors (24985).

77106839 is a wasteful number, since it uses less digits than its factorization.

77106839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24984.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 77106839 is about 8781.0499941636. The cubic root of 77106839 is about 425.6287606790.

The spelling of 77106839 in words is "seventy-seven million, one hundred six thousand, eight hundred thirty-nine".