77443440436 has 6 divisors (see below), whose sum is σ = 135526020770. Its totient is φ = 38721720216.

The previous prime is 77443440433. The next prime is 77443440443. The reversal of 77443440436 is 63404434477.

It can be written as a sum of positive squares in only one way, i.e., 77419723536 + 23716900 = 278244^2 + 4870^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77443440433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9680430051 + ... + 9680430058.

Almost surely, 2^77443440436 is an apocalyptic number.

It is an amenable number.

77443440436 is a deficient number, since it is larger than the sum of its proper divisors (58082580334).

77443440436 is a wasteful number, since it uses less digits than its factorization.

77443440436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19360860113 (or 19360860111 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 46.

The spelling of 77443440436 in words is "seventy-seven billion, four hundred forty-three million, four hundred forty thousand, four hundred thirty-six".