222878729 has 4 divisors (see below), whose sum is σ = 223517700. Its totient is φ = 222239760.

The previous prime is 222878699. The next prime is 222878741. The reversal of 222878729 is 927878222.

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 62805625 + 160073104 = 7925^2 + 12652^2 .

It is a cyclic number.

It is not a de Polignac number, because 222878729 - 2¹⁶ = 222813193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222878779) 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, 318962 + ... + 319659.

It is an arithmetic number, because the mean of its divisors is an integer number (55879425).

Almost surely, 2^222878729 is an apocalyptic number.

It is an amenable number.

222878729 is a deficient number, since it is larger than the sum of its proper divisors (638971).

222878729 is an equidigital number, since it uses as much as digits as its factorization.

222878729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638970.

The product of its digits is 451584, while the sum is 47.

The square root of 222878729 is about 14929.1235174742. The cubic root of 222878729 is about 606.3027538464.

The spelling of 222878729 in words is "two hundred twenty-two million, eight hundred seventy-eight thousand, seven hundred twenty-nine".