722507643 has 24 divisors (see below), whose sum is σ = 1226075760. Its totient is φ = 404199360.

The previous prime is 722507561. The next prime is 722507651. The reversal of 722507643 is 346705227.

It is a happy number.

722507643 is a `hidden beast` number, since 7 + 2 + 2 + 5 + 0 + 7 + 643 = 666.

It is not a de Polignac number, because 722507643 - 2¹⁶ = 722442107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 722507598 and 722507607.

It is not an unprimeable number, because it can be changed into a prime (722507143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 279408 + ... + 281981.

It is an arithmetic number, because the mean of its divisors is an integer number (51086490).

Almost surely, 2^722507643 is an apocalyptic number.

722507643 is a deficient number, since it is larger than the sum of its proper divisors (503568117).

722507643 is a wasteful number, since it uses less digits than its factorization.

722507643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561419 (or 561416 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The square root of 722507643 is about 26879.5022833385. The cubic root of 722507643 is about 897.3202772738.

The spelling of 722507643 in words is "seven hundred twenty-two million, five hundred seven thousand, six hundred forty-three".