721616500 has 48 divisors (see below), whose sum is σ = 1719297216. Its totient is φ = 262404000.

The previous prime is 721616491. The next prime is 721616501. The reversal of 721616500 is 5616127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721616501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60102 + ... + 71101.

It is an arithmetic number, because the mean of its divisors is an integer number (35818692).

Almost surely, 2^721616500 is an apocalyptic number.

It is an amenable number.

721616500 is an abundant number, since it is smaller than the sum of its proper divisors (997680716).

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

721616500 is a wasteful number, since it uses less digits than its factorization.

721616500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131233 (or 131221 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 721616500 is about 26862.9205411474. The cubic root of 721616500 is about 896.9512063596.

It can be divided in two parts, 7216 and 16500, that added together give a square (23716 = 154²).

The spelling of 721616500 in words is "seven hundred twenty-one million, six hundred sixteen thousand, five hundred".