720504157 has 4 divisors (see below), whose sum is σ = 720585180. Its totient is φ = 720423136.

The previous prime is 720504121. The next prime is 720504163. The reversal of 720504157 is 751405027.

720504157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 654796921 + 65707236 = 25589^2 + 8106^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720504157 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 (720504107) 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, 25258 + ... + 45595.

It is an arithmetic number, because the mean of its divisors is an integer number (180146295).

Almost surely, 2^720504157 is an apocalyptic number.

It is an amenable number.

720504157 is a deficient number, since it is larger than the sum of its proper divisors (81023).

720504157 is a wasteful number, since it uses less digits than its factorization.

720504157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81022.

The product of its (nonzero) digits is 9800, while the sum is 31.

The square root of 720504157 is about 26842.2084970667. The cubic root of 720504157 is about 896.4900978703.

The spelling of 720504157 in words is "seven hundred twenty million, five hundred four thousand, one hundred fifty-seven".