722387906 has 8 divisors (see below), whose sum is σ = 1094753100. Its totient is φ = 357470208.

The previous prime is 722387891. The next prime is 722387921. The reversal of 722387906 is 609783227.

It is an interprime number because it is at equal distance from previous prime (722387891) and next prime (722387921).

It can be written as a sum of positive squares in 2 ways, for example, as 672105625 + 50282281 = 25925^2 + 7091^2 .

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

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, 1861631 + ... + 1862018.

Almost surely, 2^722387906 is an apocalyptic number.

722387906 is a deficient number, since it is larger than the sum of its proper divisors (372365194).

722387906 is a wasteful number, since it uses less digits than its factorization.

722387906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3723748.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 722387906 is about 26877.2748990667. The cubic root of 722387906 is about 897.2707053074.

The spelling of 722387906 in words is "seven hundred twenty-two million, three hundred eighty-seven thousand, nine hundred six".