77381813 has 8 divisors (see below), whose sum is σ = 82437600. Its totient is φ = 72424368.

The previous prime is 77381791. The next prime is 77381819. The reversal of 77381813 is 31818377.

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 77381813 - 2¹⁶ = 77316277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77381819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22958 + ... + 26111.

It is an arithmetic number, because the mean of its divisors is an integer number (10304700).

Almost surely, 2^77381813 is an apocalyptic number.

It is an amenable number.

77381813 is a deficient number, since it is larger than the sum of its proper divisors (5055787).

77381813 is a wasteful number, since it uses less digits than its factorization.

77381813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49171.

The product of its digits is 28224, while the sum is 38.

The square root of 77381813 is about 8796.6932991892. The cubic root of 77381813 is about 426.1341114190.

The spelling of 77381813 in words is "seventy-seven million, three hundred eighty-one thousand, eight hundred thirteen".