77824260893 has 4 divisors (see below), whose sum is σ = 79292643228. Its totient is φ = 76355878560.

The previous prime is 77824260881. The next prime is 77824260929. The reversal of 77824260893 is 39806242877.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39806242877 = 163 ⋅244210079.

It can be written as a sum of positive squares in 2 ways, for example, as 40699834564 + 37124426329 = 201742^2 + 192677^2 .

It is a cyclic number.

It is not a de Polignac number, because 77824260893 - 2¹⁰ = 77824259869 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 (77824263893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 734191088 + ... + 734191193.

It is an arithmetic number, because the mean of its divisors is an integer number (19823160807).

Almost surely, 2^77824260893 is an apocalyptic number.

It is an amenable number.

77824260893 is a deficient number, since it is larger than the sum of its proper divisors (1468382335).

77824260893 is a wasteful number, since it uses less digits than its factorization.

77824260893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1468382334.

The product of its (nonzero) digits is 8128512, while the sum is 56.

The spelling of 77824260893 in words is "seventy-seven billion, eight hundred twenty-four million, two hundred sixty thousand, eight hundred ninety-three".