730321920 has 264 divisors, whose sum is σ = 2628741024. Its totient is φ = 194420736.

The previous prime is 730321913. The next prime is 730321931. The reversal of 730321920 is 29123037.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1243867 + ... + 1244453.

Almost surely, 2^730321920 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 730321920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1314370512).

730321920 is an abundant number, since it is smaller than the sum of its proper divisors (1898419104).

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

730321920 is an equidigital number, since it uses as much as digits as its factorization.

730321920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627 (or 597 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 27.

The square root of 730321920 is about 27024.4689124504. The cubic root of 730321920 is about 900.5436715131.

Adding to 730321920 its reverse (29123037), we get a palindrome (759444957).

The spelling of 730321920 in words is "seven hundred thirty million, three hundred twenty-one thousand, nine hundred twenty".