722560640 has 128 divisors (see below), whose sum is σ = 1818961920. Its totient is φ = 273940480.

The previous prime is 722560637. The next prime is 722560661. The reversal of 722560640 is 46065227.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 722560597 and 722560606.

It is an unprimeable number.

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, 2811392 + ... + 2811648.

It is an arithmetic number, because the mean of its divisors is an integer number (14210640).

Almost surely, 2^722560640 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 722560640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (909480960).

722560640 is an abundant number, since it is smaller than the sum of its proper divisors (1096401280).

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

722560640 is a wasteful number, since it uses less digits than its factorization.

722560640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490 (or 478 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 722560640 is about 26880.4880908067. The cubic root of 722560640 is about 897.3422166588.

The spelling of 722560640 in words is "seven hundred twenty-two million, five hundred sixty thousand, six hundred forty".