77731379 has 8 divisors (see below), whose sum is σ = 86235840. Its totient is φ = 69466600.

The previous prime is 77731369. The next prime is 77731387. The reversal of 77731379 is 97313777.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-77731379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77731309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59237 + ... + 60534.

It is an arithmetic number, because the mean of its divisors is an integer number (10779480).

Almost surely, 2^77731379 is an apocalyptic number.

77731379 is a deficient number, since it is larger than the sum of its proper divisors (8504461).

77731379 is a wasteful number, since it uses less digits than its factorization.

77731379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119841.

The product of its digits is 194481, while the sum is 44.

The square root of 77731379 is about 8816.5400810068. The cubic root of 77731379 is about 426.7748229093.

The spelling of 77731379 in words is "seventy-seven million, seven hundred thirty-one thousand, three hundred seventy-nine".