730239640 has 64 divisors (see below), whose sum is σ = 1777073760. Its totient is φ = 268462080.

The previous prime is 730239623. The next prime is 730239647. The reversal of 730239640 is 46932037.

It is a junction number, because it is equal to n+sod(n) for n = 730239596 and 730239605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (730239647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122407 + ... + 128233.

Almost surely, 2^730239640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 730239640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (888536880).

730239640 is an abundant number, since it is smaller than the sum of its proper divisors (1046834120).

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

730239640 is a wasteful number, since it uses less digits than its factorization.

730239640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6092 (or 6088 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 34.

The square root of 730239640 is about 27022.9465454824. The cubic root of 730239640 is about 900.5098510320.

The spelling of 730239640 in words is "seven hundred thirty million, two hundred thirty-nine thousand, six hundred forty".