721954740 has 96 divisors (see below), whose sum is σ = 2196504576. Its totient is φ = 176117760.

The previous prime is 721954729. The next prime is 721954747. The reversal of 721954740 is 47459127.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721954747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 84045 + ... + 92235.

It is an arithmetic number, because the mean of its divisors is an integer number (22880256).

Almost surely, 2^721954740 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 721954740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1098252288).

721954740 is an abundant number, since it is smaller than the sum of its proper divisors (1474549836).

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

721954740 is a wasteful number, since it uses less digits than its factorization.

721954740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8329 (or 8327 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 721954740 is about 26869.2154704971. The cubic root of 721954740 is about 897.0913257476.

The spelling of 721954740 in words is "seven hundred twenty-one million, nine hundred fifty-four thousand, seven hundred forty".