726621440 has 36 divisors (see below), whose sum is σ = 1740488484. Its totient is φ = 290648064.

The previous prime is 726621433. The next prime is 726621449. The reversal of 726621440 is 44126627.

It can be written as a sum of positive squares in 2 ways, for example, as 389825536 + 336795904 = 19744^2 + 18352^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 726621397 and 726621406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726621449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282557 + ... + 285116.

Almost surely, 2^726621440 is an apocalyptic number.

It is an amenable number.

726621440 is an abundant number, since it is smaller than the sum of its proper divisors (1013867044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

726621440 is an equidigital number, since it uses as much as digits as its factorization.

726621440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567694 (or 567680 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 726621440 is about 26955.9166047085. The cubic root of 726621440 is about 899.0201022230.

The spelling of 726621440 in words is "seven hundred twenty-six million, six hundred twenty-one thousand, four hundred forty".