720139705 has 16 divisors (see below), whose sum is σ = 889732800. Its totient is φ = 559234368.

The previous prime is 720139699. The next prime is 720139727. The reversal of 720139705 is 507931027.

720139705 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 720139705 - 2³ = 720139697 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24771 + ... + 45319.

It is an arithmetic number, because the mean of its divisors is an integer number (55608300).

Almost surely, 2^720139705 is an apocalyptic number.

It is an amenable number.

720139705 is a deficient number, since it is larger than the sum of its proper divisors (169593095).

720139705 is a wasteful number, since it uses less digits than its factorization.

720139705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20760.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 720139705 is about 26835.4188527029. The cubic root of 720139705 is about 896.3389154375.

It can be divided in two parts, 72013 and 9705, that added together give a palindrome (81718).

The spelling of 720139705 in words is "seven hundred twenty million, one hundred thirty-nine thousand, seven hundred five".