720707040 has 144 divisors (see below), whose sum is σ = 2476656000. Its totient is φ = 190841856.

The previous prime is 720707033. The next prime is 720707059. The reversal of 720707040 is 40707027.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 720706995 and 720707013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 212881 + ... + 216239.

It is an arithmetic number, because the mean of its divisors is an integer number (17199000).

Almost surely, 2^720707040 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 720707040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238328000).

720707040 is an abundant number, since it is smaller than the sum of its proper divisors (1755948960).

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

720707040 is a wasteful number, since it uses less digits than its factorization.

720707040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3529 (or 3518 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 27.

The square root of 720707040 is about 26845.9874096670. The cubic root of 720707040 is about 896.5742359606.

The spelling of 720707040 in words is "seven hundred twenty million, seven hundred seven thousand, forty".