222497778 has 8 divisors (see below), whose sum is σ = 444995568. Its totient is φ = 74165924.

The previous prime is 222497753. The next prime is 222497783. The reversal of 222497778 is 877794222.

It is a happy number.

222497778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

222497778 is an admirable number.

It is a super-2 number, since 2×222497778² = 99010522429874568, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18541476 + ... + 18541487.

It is an arithmetic number, because the mean of its divisors is an integer number (55624446).

Almost surely, 2^222497778 is an apocalyptic number.

222497778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

222497778 is a wasteful number, since it uses less digits than its factorization.

222497778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37082968.

The product of its digits is 790272, while the sum is 48.

The square root of 222497778 is about 14916.3594083811. The cubic root of 222497778 is about 605.9571199059.

The spelling of 222497778 in words is "two hundred twenty-two million, four hundred ninety-seven thousand, seven hundred seventy-eight".