721374672 has 80 divisors (see below), whose sum is σ = 1970984960. Its totient is φ = 226717056.

The previous prime is 721374649. The next prime is 721374677. The reversal of 721374672 is 276473127.

It is a self number, because there is not a number n which added to its sum of digits gives 721374672.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721374677) 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, 201603 + ... + 205149.

It is an arithmetic number, because the mean of its divisors is an integer number (24637312).

Almost surely, 2^721374672 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 721374672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (985492480).

721374672 is an abundant number, since it is smaller than the sum of its proper divisors (1249610288).

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

721374672 is a wasteful number, since it uses less digits than its factorization.

721374672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3800 (or 3794 counting only the distinct ones).

The product of its digits is 98784, while the sum is 39.

The square root of 721374672 is about 26858.4190152734. The cubic root of 721374672 is about 896.8509997859.

The spelling of 721374672 in words is "seven hundred twenty-one million, three hundred seventy-four thousand, six hundred seventy-two".