721678000 has 80 divisors (see below), whose sum is σ = 1769279616. Its totient is φ = 284659200.

The previous prime is 721677973. The next prime is 721678019. The reversal of 721678000 is 876127.

It is a happy number.

721678000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143529 + ... + 148471.

Almost surely, 2^721678000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721678000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (884639808).

721678000 is an abundant number, since it is smaller than the sum of its proper divisors (1047601616).

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

721678000 is a wasteful number, since it uses less digits than its factorization.

721678000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5039 (or 5023 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 721678000 is about 26864.0652173121. The cubic root of 721678000 is about 896.9766866215.

The spelling of 721678000 in words is "seven hundred twenty-one million, six hundred seventy-eight thousand".