721632718 has 16 divisors (see below), whose sum is σ = 1115511264. Its totient is φ = 349901440.

The previous prime is 721632713. The next prime is 721632739. The reversal of 721632718 is 817236127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721632713) 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, 12655 + ... + 40042.

It is an arithmetic number, because the mean of its divisors is an integer number (69719454).

Almost surely, 2^721632718 is an apocalyptic number.

721632718 is a deficient number, since it is larger than the sum of its proper divisors (393878546).

721632718 is a wasteful number, since it uses less digits than its factorization.

721632718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52907.

The product of its digits is 28224, while the sum is 37.

The square root of 721632718 is about 26863.2224053631. Note that the first 3 decimals coincide. The cubic root of 721632718 is about 896.9579258316.

The spelling of 721632718 in words is "seven hundred twenty-one million, six hundred thirty-two thousand, seven hundred eighteen".