721001040 has 80 divisors (see below), whose sum is σ = 2243267136. Its totient is φ = 191564800.

The previous prime is 721001027. The next prime is 721001077. The reversal of 721001040 is 40100127.

721001040 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 a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

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, 62095 + ... + 72785.

Almost surely, 2^721001040 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 721001040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1121633568).

721001040 is an abundant number, since it is smaller than the sum of its proper divisors (1522266096).

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

721001040 is a wasteful number, since it uses less digits than its factorization.

721001040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10988 (or 10982 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 721001040 is about 26851.4625300001. The cubic root of 721001040 is about 896.6961333827.

Adding to 721001040 its reverse (40100127), we get a palindrome (761101167).

The spelling of 721001040 in words is "seven hundred twenty-one million, one thousand, forty".