722222906 has 8 divisors (see below), whose sum is σ = 1112613780. Its totient is φ = 351351648.

The previous prime is 722222899. The next prime is 722222933. The reversal of 722222906 is 609222227.

It can be written as a sum of positive squares in 2 ways, for example, as 558613225 + 163609681 = 23635^2 + 12791^2 .

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

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, 4879811 + ... + 4879958.

Almost surely, 2^722222906 is an apocalyptic number.

722222906 is a deficient number, since it is larger than the sum of its proper divisors (390390874).

722222906 is a wasteful number, since it uses less digits than its factorization.

722222906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9759808.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 722222906 is about 26874.2052161548. The cubic root of 722222906 is about 897.2023851622.

The spelling of 722222906 in words is "seven hundred twenty-two million, two hundred twenty-two thousand, nine hundred six".