730312320 has 128 divisors (see below), whose sum is σ = 2377693440. Its totient is φ = 190582784.

The previous prime is 730312309. The next prime is 730312381. The reversal of 730312320 is 23213037.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86194 + ... + 94286.

It is an arithmetic number, because the mean of its divisors is an integer number (18575730).

Almost surely, 2^730312320 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 730312320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1188846720).

730312320 is an abundant number, since it is smaller than the sum of its proper divisors (1647381120).

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

730312320 is a wasteful number, since it uses less digits than its factorization.

730312320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8162 (or 8150 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 730312320 is about 27024.2912950553. The cubic root of 730312320 is about 900.5397256472.

Adding to 730312320 its reverse (23213037), we get a palindrome (753525357).

The spelling of 730312320 in words is "seven hundred thirty million, three hundred twelve thousand, three hundred twenty".