77778223 has 8 divisors (see below), whose sum is σ = 79263792. Its totient is φ = 76302336.

The previous prime is 77778167. The next prime is 77778227. The reversal of 77778223 is 32287777.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77778223 - 2²⁵ = 44223791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77778223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77778227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14961 + ... + 19477.

It is an arithmetic number, because the mean of its divisors is an integer number (9907974).

Almost surely, 2^77778223 is an apocalyptic number.

77778223 is a deficient number, since it is larger than the sum of its proper divisors (1485569).

77778223 is a wasteful number, since it uses less digits than its factorization.

77778223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4841.

The product of its digits is 230496, while the sum is 43.

The square root of 77778223 is about 8819.1962785732. The cubic root of 77778223 is about 426.8605361499.

The spelling of 77778223 in words is "seventy-seven million, seven hundred seventy-eight thousand, two hundred twenty-three".