721616450 has 48 divisors (see below), whose sum is σ = 1401338880. Its totient is φ = 276144000.

The previous prime is 721616449. The next prime is 721616491. The reversal of 721616450 is 54616127.

It is a super-3 number, since 3×721616450³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135335 + ... + 140565.

It is an arithmetic number, because the mean of its divisors is an integer number (29194560).

Almost surely, 2^721616450 is an apocalyptic number.

721616450 is a deficient number, since it is larger than the sum of its proper divisors (679722430).

721616450 is a wasteful number, since it uses less digits than its factorization.

721616450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5363 (or 5358 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 721616450 is about 26862.9196104965. The cubic root of 721616450 is about 896.9511856433.

The spelling of 721616450 in words is "seven hundred twenty-one million, six hundred sixteen thousand, four hundred fifty".