730000 has 50 divisors (see below), whose sum is σ = 1791614. Its totient is φ = 288000.

The previous prime is 729991. The next prime is 730003. The reversal of 730000 is 37.

730000 is nontrivially palindromic in base 9.

It can be written as a sum of positive squares in 5 ways, for example, as 262144 + 467856 = 512^2 + 684^2 .

It is a tau number, because it is divible by the number of its divisors (50).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (730003) by changing a digit.

730000 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 9964 + ... + 10036.

2⁷³⁰⁰⁰⁰ 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 730000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (895807).

730000 is an abundant number, since it is smaller than the sum of its proper divisors (1061614).

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

730000 is an equidigital number, since it uses as much as digits as its factorization.

730000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 21, while the sum is 10.

The square root of 730000 is about 854.4003745318. The cubic root of 730000 is about 90.0411334609.

Adding to 730000 its reverse (37), we get a palindrome (730037).

The spelling of 730000 in words is "seven hundred thirty thousand".