77312543 has 32 divisors (see below), whose sum is σ = 101683200. Its totient is φ = 58212000.

The previous prime is 77312537. The next prime is 77312561. The reversal of 77312543 is 34521377.

It is not a de Polignac number, because 77312543 - 2¹⁴ = 77296159 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 (77312503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116633 + ... + 117293.

It is an arithmetic number, because the mean of its divisors is an integer number (3177600).

Almost surely, 2^77312543 is an apocalyptic number.

77312543 is a deficient number, since it is larger than the sum of its proper divisors (24370657).

77312543 is a wasteful number, since it uses less digits than its factorization.

77312543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724 (or 710 counting only the distinct ones).

The product of its digits is 17640, while the sum is 32.

The square root of 77312543 is about 8792.7551427297. The cubic root of 77312543 is about 426.0069190762.

The spelling of 77312543 in words is "seventy-seven million, three hundred twelve thousand, five hundred forty-three".