721320446 has 96 divisors (see below), whose sum is σ = 1455041280. Its totient is φ = 261740160.

The previous prime is 721320443. The next prime is 721320463. The reversal of 721320446 is 644023127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721320443) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2349425 + ... + 2349731.

It is an arithmetic number, because the mean of its divisors is an integer number (15156680).

Almost surely, 2^721320446 is an apocalyptic number.

721320446 is an abundant number, since it is smaller than the sum of its proper divisors (733720834).

721320446 is a wasteful number, since it uses less digits than its factorization.

721320446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430 (or 419 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 721320446 is about 26857.4095176731. The cubic root of 721320446 is about 896.8285270161.

The spelling of 721320446 in words is "seven hundred twenty-one million, three hundred twenty thousand, four hundred forty-six".