721049616 has 240 divisors, whose sum is σ = 2404846080. Its totient is φ = 197406720.

The previous prime is 721049603. The next prime is 721049617. The reversal of 721049616 is 616940127.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721049617) 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 47 ways as a sum of consecutive naturals, for example, 3016825 + ... + 3017063.

It is an arithmetic number, because the mean of its divisors is an integer number (10020192).

Almost surely, 2^721049616 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 721049616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1202423040).

721049616 is an abundant number, since it is smaller than the sum of its proper divisors (1683796464).

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

721049616 is a wasteful number, since it uses less digits than its factorization.

721049616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 721049616 is about 26852.3670465008. The cubic root of 721049616 is about 896.7162706321.

The spelling of 721049616 in words is "seven hundred twenty-one million, forty-nine thousand, six hundred sixteen".