721443000730 has 32 divisors (see below), whose sum is σ = 1322896898880. Its totient is φ = 283194270720.

The previous prime is 721443000703. The next prime is 721443000781. The reversal of 721443000730 is 37000344127.

It is a junction number, because it is equal to n+sod(n) for n = 721443000692 and 721443000701.

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, 719176 + ... + 1400035.

It is an arithmetic number, because the mean of its divisors is an integer number (41340528090).

Almost surely, 2^721443000730 is an apocalyptic number.

721443000730 is a deficient number, since it is larger than the sum of its proper divisors (601453898150).

721443000730 is a wasteful number, since it uses less digits than its factorization.

721443000730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119854.

The product of its (nonzero) digits is 14112, while the sum is 31.

Adding to 721443000730 its reverse (37000344127), we get a palindrome (758443344857).

The spelling of 721443000730 in words is "seven hundred twenty-one billion, four hundred forty-three million, seven hundred thirty", and thus it is an aban number.