520728261 has 8 divisors (see below), whose sum is σ = 694428384. Its totient is φ = 347090160.

The previous prime is 520728253. The next prime is 520728283. The reversal of 520728261 is 162827025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 520728261 - 2³ = 520728253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520728251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10155 + ... + 33831.

It is an arithmetic number, because the mean of its divisors is an integer number (86803548).

Almost surely, 2^520728261 is an apocalyptic number.

It is an amenable number.

520728261 is a deficient number, since it is larger than the sum of its proper divisors (173700123).

520728261 is a wasteful number, since it uses less digits than its factorization.

520728261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31011.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 520728261 is about 22819.4710937830. The cubic root of 520728261 is about 804.5203788806.

The spelling of 520728261 in words is "five hundred twenty million, seven hundred twenty-eight thousand, two hundred sixty-one".