77780343 has 4 divisors (see below), whose sum is σ = 103707128. Its totient is φ = 51853560.

The previous prime is 77780341. The next prime is 77780359. The reversal of 77780343 is 34308777.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34308777 = 3 ⋅11436259.

It is not a de Polignac number, because 77780343 - 2¹ = 77780341 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 (77780341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12963388 + ... + 12963393.

It is an arithmetic number, because the mean of its divisors is an integer number (25926782).

Almost surely, 2^77780343 is an apocalyptic number.

77780343 is a deficient number, since it is larger than the sum of its proper divisors (25926785).

77780343 is a wasteful number, since it uses less digits than its factorization.

77780343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25926784.

The product of its (nonzero) digits is 98784, while the sum is 39.

The square root of 77780343 is about 8819.3164701126. The cubic root of 77780343 is about 426.8644144254.

The spelling of 77780343 in words is "seventy-seven million, seven hundred eighty thousand, three hundred forty-three".