721720010 has 16 divisors (see below), whose sum is σ = 1417195872. Its totient is φ = 262443600.

The previous prime is 721720009. The next prime is 721720019. The reversal of 721720010 is 10027127.

It is not an unprimeable number, because it can be changed into a prime (721720019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3280436 + ... + 3280655.

It is an arithmetic number, because the mean of its divisors is an integer number (88574742).

Almost surely, 2^721720010 is an apocalyptic number.

721720010 is a deficient number, since it is larger than the sum of its proper divisors (695475862).

721720010 is a wasteful number, since it uses less digits than its factorization.

721720010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6561109.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 721720010 is about 26864.8471054648. The cubic root of 721720010 is about 896.9940910869.

Adding to 721720010 its reverse (10027127), we get a palindrome (731747137).

The spelling of 721720010 in words is "seven hundred twenty-one million, seven hundred twenty thousand, ten".