77316991 has 8 divisors (see below), whose sum is σ = 78004224. Its totient is φ = 76633080.

The previous prime is 77316977. The next prime is 77316997. The reversal of 77316991 is 19961377.

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

It is a cyclic number.

It is not a de Polignac number, because 77316991 - 2⁵ = 77316959 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 (77316997) 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 7 ways as a sum of consecutive naturals, for example, 69546 + ... + 70648.

It is an arithmetic number, because the mean of its divisors is an integer number (9750528).

Almost surely, 2^77316991 is an apocalyptic number.

77316991 is a deficient number, since it is larger than the sum of its proper divisors (687233).

77316991 is a wasteful number, since it uses less digits than its factorization.

77316991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661.

The product of its digits is 71442, while the sum is 43.

The square root of 77316991 is about 8793.0080746011. The cubic root of 77316991 is about 426.0150886968.

The spelling of 77316991 in words is "seventy-seven million, three hundred sixteen thousand, nine hundred ninety-one".