720128122 has 16 divisors (see below), whose sum is σ = 1235488320. Its totient is φ = 308380608.

The previous prime is 720128039. The next prime is 720128131. The reversal of 720128122 is 221821027.

720128122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1672 + ... + 37987.

It is an arithmetic number, because the mean of its divisors is an integer number (77218020).

Almost surely, 2^720128122 is an apocalyptic number.

720128122 is a deficient number, since it is larger than the sum of its proper divisors (515360198).

720128122 is a wasteful number, since it uses less digits than its factorization.

720128122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40965.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 720128122 is about 26835.2030363103. The cubic root of 720128122 is about 896.3341097267.

Adding to 720128122 its reverse (221821027), we get a palindrome (941949149).

The spelling of 720128122 in words is "seven hundred twenty million, one hundred twenty-eight thousand, one hundred twenty-two".