77321679 has 4 divisors (see below), whose sum is σ = 103095576. Its totient is φ = 51547784.

The previous prime is 77321677. The next prime is 77321711. The reversal of 77321679 is 97612377.

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 77321679 - 2¹ = 77321677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77321679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77321677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12886944 + ... + 12886949.

It is an arithmetic number, because the mean of its divisors is an integer number (25773894).

Almost surely, 2^77321679 is an apocalyptic number.

77321679 is a deficient number, since it is larger than the sum of its proper divisors (25773897).

77321679 is a wasteful number, since it uses less digits than its factorization.

77321679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25773896.

The product of its digits is 111132, while the sum is 42.

The square root of 77321679 is about 8793.2746460008. The cubic root of 77321679 is about 426.0236987852.

The spelling of 77321679 in words is "seventy-seven million, three hundred twenty-one thousand, six hundred seventy-nine".