722816643 has 8 divisors (see below), whose sum is σ = 967045968. Its totient is φ = 480232544.

The previous prime is 722816629. The next prime is 722816651. The reversal of 722816643 is 346618227.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 722816643 - 2⁶ = 722816579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (722816603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 410280 + ... + 412037.

It is an arithmetic number, because the mean of its divisors is an integer number (120880746).

Almost surely, 2^722816643 is an apocalyptic number.

722816643 is a deficient number, since it is larger than the sum of its proper divisors (244229325).

722816643 is a wasteful number, since it uses less digits than its factorization.

722816643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822613.

The product of its digits is 96768, while the sum is 39.

The square root of 722816643 is about 26885.2495431975. The cubic root of 722816643 is about 897.4481801641.

It can be divided in two parts, 7228 and 16643, that added together give a triangular number (23871 = T₂₁₈).

The spelling of 722816643 in words is "seven hundred twenty-two million, eight hundred sixteen thousand, six hundred forty-three".