223999778 has 18 divisors (see below), whose sum is σ = 355252401. Its totient is φ = 105914664.

The previous prime is 223999777. The next prime is 223999781. The reversal of 223999778 is 877999322.

It can be written as a sum of positive squares in 2 ways, for example, as 175377049 + 48622729 = 13243^2 + 6973^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=10583.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223999777) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 401876 + ... + 402432.

Almost surely, 2^223999778 is an apocalyptic number.

223999778 is a deficient number, since it is larger than the sum of its proper divisors (131252623).

223999778 is an frugal number, since it uses more digits than its factorization.

223999778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154 (or 578 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 56.

The square root of 223999778 is about 14966.6221305945. The cubic root of 223999778 is about 607.3175937433.

It can be divided in two parts, 223 and 999778, that added together give a palindrome (1000001).

The spelling of 223999778 in words is "two hundred twenty-three million, nine hundred ninety-nine thousand, seven hundred seventy-eight".