721030 has 8 divisors (see below), whose sum is σ = 1297872. Its totient is φ = 288408.

The previous prime is 721013. The next prime is 721037. The reversal of 721030 is 30127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 721030.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36042 + ... + 36061.

It is an arithmetic number, because the mean of its divisors is an integer number (162234).

2⁷²¹⁰³⁰ is an apocalyptic number.

721030 is a deficient number, since it is larger than the sum of its proper divisors (576842).

721030 is a wasteful number, since it uses less digits than its factorization.

721030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72110.

The product of its (nonzero) digits is 42, while the sum is 13.

The square root of 721030 is about 849.1348538365. The cubic root of 721030 is about 89.6708138900.

Adding to 721030 its reverse (30127), we get a palindrome (751157).

The spelling of 721030 in words is "seven hundred twenty-one thousand, thirty".