720548640 has 144 divisors (see below), whose sum is σ = 2810179008. Its totient is φ = 164694528.

The previous prime is 720548639. The next prime is 720548641. The reversal of 720548640 is 46845027.

720548640 is a `hidden beast` number, since 7 + 2 + 0 + 5 + 4 + 8 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (720548639) and next prime (720548641).

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a junction number, because it is equal to n+sod(n) for n = 720548595 and 720548604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720548641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25662 + ... + 45821.

It is an arithmetic number, because the mean of its divisors is an integer number (19515132).

Almost surely, 2^720548640 is an apocalyptic number.

720548640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

720548640 is an abundant number, since it is smaller than the sum of its proper divisors (2089630368).

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

720548640 is a wasteful number, since it uses less digits than its factorization.

720548640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71511 (or 71500 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 720548640 is about 26843.0370859931. The cubic root of 720548640 is about 896.5085468726.

The spelling of 720548640 in words is "seven hundred twenty million, five hundred forty-eight thousand, six hundred forty".