77443445 has 4 divisors (see below), whose sum is σ = 92932140. Its totient is φ = 61954752.

The previous prime is 77443423. The next prime is 77443453. The reversal of 77443445 is 54434477.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54037201 + 23406244 = 7351^2 + 4838^2 .

It is a cyclic number.

It is not a de Polignac number, because 77443445 - 2⁸ = 77443189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77443399 and 77443408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7744340 + ... + 7744349.

It is an arithmetic number, because the mean of its divisors is an integer number (23233035).

Almost surely, 2^77443445 is an apocalyptic number.

It is an amenable number.

77443445 is a deficient number, since it is larger than the sum of its proper divisors (15488695).

77443445 is a wasteful number, since it uses less digits than its factorization.

77443445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15488694.

The product of its digits is 188160, while the sum is 38.

The square root of 77443445 is about 8800.1957364595. The cubic root of 77443445 is about 426.2472152047.

The spelling of 77443445 in words is "seventy-seven million, four hundred forty-three thousand, four hundred forty-five".