726643442 has 30 divisors (see below), whose sum is σ = 1274827533. Its totient is φ = 310618056.

The previous prime is 726643433. The next prime is 726643483. The reversal of 726643442 is 244346627.

It can be written as a sum of positive squares in 2 ways, for example, as 671898241 + 54745201 = 25921^2 + 7399^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=19061.

It is a junction number, because it is equal to n+sod(n) for n = 726643396 and 726643405.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1867784 + ... + 1868172.

Almost surely, 2^726643442 is an apocalyptic number.

726643442 is a deficient number, since it is larger than the sum of its proper divisors (548184091).

726643442 is an frugal number, since it uses more digits than its factorization.

726643442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808 (or 398 counting only the distinct ones).

The product of its digits is 193536, while the sum is 38.

The square root of 726643442 is about 26956.3247123936. The cubic root of 726643442 is about 899.0291762009.

The spelling of 726643442 in words is "seven hundred twenty-six million, six hundred forty-three thousand, four hundred forty-two".