726313640 has 32 divisors (see below), whose sum is σ = 1759915080. Its totient is φ = 268177152.

The previous prime is 726313571. The next prime is 726313657. The reversal of 726313640 is 46313627.

It can be written as a sum of positive squares in 4 ways, for example, as 511573924 + 214739716 = 22618^2 + 14654^2 .

It is a junction number, because it is equal to n+sod(n) for n = 726313597 and 726313606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 697859 + ... + 698898.

Almost surely, 2^726313640 is an apocalyptic number.

It is an amenable number.

726313640 is an abundant number, since it is smaller than the sum of its proper divisors (1033601440).

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

726313640 is a wasteful number, since it uses less digits than its factorization.

726313640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396781 (or 1396777 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 726313640 is about 26950.2066782427. The cubic root of 726313640 is about 898.8931413534.

The spelling of 726313640 in words is "seven hundred twenty-six million, three hundred thirteen thousand, six hundred forty".