721630130 has 32 divisors (see below), whose sum is σ = 1400523264. Its totient is φ = 266129856.

The previous prime is 721630123. The next prime is 721630141. The reversal of 721630130 is 31036127.

It is a happy number.

It is a super-3 number, since 3×721630130³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 721630096 and 721630105.

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, 124967 + ... + 130613.

It is an arithmetic number, because the mean of its divisors is an integer number (43766352).

Almost surely, 2^721630130 is an apocalyptic number.

721630130 is a deficient number, since it is larger than the sum of its proper divisors (678893134).

721630130 is a wasteful number, since it uses less digits than its factorization.

721630130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6650.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 721630130 is about 26863.1742353729. The cubic root of 721630130 is about 896.9568535734.

Adding to 721630130 its reverse (31036127), we get a palindrome (752666257).

The spelling of 721630130 in words is "seven hundred twenty-one million, six hundred thirty thousand, one hundred thirty".