223994778 has 64 divisors (see below), whose sum is σ = 539443200. Its totient is φ = 61916400.

The previous prime is 223994777. The next prime is 223994789. The reversal of 223994778 is 877499322.

It is a self number, because there is not a number n which added to its sum of digits gives 223994778.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223994773) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62043 + ... + 65553.

It is an arithmetic number, because the mean of its divisors is an integer number (8428800).

Almost surely, 2^223994778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 223994778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269721600).

223994778 is an abundant number, since it is smaller than the sum of its proper divisors (315448422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

223994778 is a wasteful number, since it uses less digits than its factorization.

223994778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3568 (or 3554 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 51.

The square root of 223994778 is about 14966.4550913034. The cubic root of 223994778 is about 607.3130749731.

The spelling of 223994778 in words is "two hundred twenty-three million, nine hundred ninety-four thousand, seven hundred seventy-eight".