722236642 has 4 divisors (see below), whose sum is σ = 1083354966. Its totient is φ = 361118320.

The previous prime is 722236621. The next prime is 722236649. The reversal of 722236642 is 246632227.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 480091921 + 242144721 = 21911^2 + 15561^2 .

It is a junction number, because it is equal to n+sod(n) for n = 722236598 and 722236607.

It is not an unprimeable number, because it can be changed into a prime (722236649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180559159 + ... + 180559162.

Almost surely, 2^722236642 is an apocalyptic number.

722236642 is a deficient number, since it is larger than the sum of its proper divisors (361118324).

722236642 is a wasteful number, since it uses less digits than its factorization.

722236642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361118323.

The product of its digits is 48384, while the sum is 34.

The square root of 722236642 is about 26874.4607759858. The cubic root of 722236642 is about 897.2080731079.

Adding to 722236642 its reverse (246632227), we get a palindrome (968868869).

The spelling of 722236642 in words is "seven hundred twenty-two million, two hundred thirty-six thousand, six hundred forty-two".