720225557 has 4 divisors (see below), whose sum is σ = 737792076. Its totient is φ = 702659040.

The previous prime is 720225529. The next prime is 720225559. The reversal of 720225557 is 755522027.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50140561 + 670084996 = 7081^2 + 25886^2 .

It is a cyclic number.

It is not a de Polignac number, because 720225557 - 2⁸ = 720225301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720225559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8783198 + ... + 8783279.

It is an arithmetic number, because the mean of its divisors is an integer number (184448019).

Almost surely, 2^720225557 is an apocalyptic number.

It is an amenable number.

720225557 is a deficient number, since it is larger than the sum of its proper divisors (17566519).

720225557 is a wasteful number, since it uses less digits than its factorization.

720225557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17566518.

The product of its (nonzero) digits is 49000, while the sum is 35.

The square root of 720225557 is about 26837.0184074163. The cubic root of 720225557 is about 896.3745332628.

The spelling of 720225557 in words is "seven hundred twenty million, two hundred twenty-five thousand, five hundred fifty-seven".