77643223 has 4 divisors (see below), whose sum is σ = 88735120. Its totient is φ = 66551328.

The previous prime is 77643221. The next prime is 77643227. The reversal of 77643223 is 32234677.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 77643223 - 2¹ = 77643221 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 (77643221) 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, 5545938 + ... + 5545951.

It is an arithmetic number, because the mean of its divisors is an integer number (22183780).

Almost surely, 2^77643223 is an apocalyptic number.

77643223 is a deficient number, since it is larger than the sum of its proper divisors (11091897).

77643223 is a wasteful number, since it uses less digits than its factorization.

77643223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11091896.

The product of its digits is 42336, while the sum is 34.

The square root of 77643223 is about 8811.5391958500. The cubic root of 77643223 is about 426.6134252278.

The spelling of 77643223 in words is "seventy-seven million, six hundred forty-three thousand, two hundred twenty-three".