726580640 has 24 divisors (see below), whose sum is σ = 1716547140. Its totient is φ = 290632192.

The previous prime is 726580637. The next prime is 726580651. The reversal of 726580640 is 46085627.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 721029904 + 5550736 = 26852^2 + 2356^2 .

It is a junction number, because it is equal to n+sod(n) for n = 726580594 and 726580603.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2270405 + ... + 2270724.

Almost surely, 2^726580640 is an apocalyptic number.

It is an amenable number.

726580640 is an abundant number, since it is smaller than the sum of its proper divisors (989966500).

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

726580640 is a wasteful number, since it uses less digits than its factorization.

726580640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4541144 (or 4541136 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 726580640 is about 26955.1598029023. The cubic root of 726580640 is about 899.0032751634.

The spelling of 726580640 in words is "seven hundred twenty-six million, five hundred eighty thousand, six hundred forty".