721404450 has 144 divisors (see below), whose sum is σ = 2105865216. Its totient is φ = 175996800.

The previous prime is 721404449. The next prime is 721404461. The reversal of 721404450 is 54404127.

721404450 is a `hidden beast` number, since 7 + 214 + 0 + 445 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 742465 + ... + 743435.

It is an arithmetic number, because the mean of its divisors is an integer number (14624064).

Almost surely, 2^721404450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721404450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1052932608).

721404450 is an abundant number, since it is smaller than the sum of its proper divisors (1384460766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721404450 is a wasteful number, since it uses less digits than its factorization.

721404450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129 (or 1121 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 721404450 is about 26858.9733608714. The cubic root of 721404450 is about 896.8633401423.

Adding to 721404450 its reverse (54404127), we get a palindrome (775808577).

The spelling of 721404450 in words is "seven hundred twenty-one million, four hundred four thousand, four hundred fifty".