721447376 has 80 divisors (see below), whose sum is σ = 1567899648. Its totient is φ = 319334400.

The previous prime is 721447373. The next prime is 721447381. The reversal of 721447376 is 673744127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721447373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 818456 + ... + 819336.

Almost surely, 2^721447376 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 721447376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (783949824).

721447376 is an abundant number, since it is smaller than the sum of its proper divisors (846452272).

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

721447376 is a wasteful number, since it uses less digits than its factorization.

721447376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1060 (or 1054 counting only the distinct ones).

The product of its digits is 197568, while the sum is 41.

The square root of 721447376 is about 26859.7724487755. The cubic root of 721447376 is about 896.8811285882.

The spelling of 721447376 in words is "seven hundred twenty-one million, four hundred forty-seven thousand, three hundred seventy-six".