520728390001 has 4 divisors (see below), whose sum is σ = 520796298100. Its totient is φ = 520660481904.

The previous prime is 520728389977. The next prime is 520728390019. The reversal of 520728390001 is 100093827025.

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 490771703601 + 29956686400 = 700551^2 + 173080^2 .

It is a cyclic number.

It is not a de Polignac number, because 520728390001 - 2¹¹ = 520728387953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520728390401) 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, 33942546 + ... + 33957883.

It is an arithmetic number, because the mean of its divisors is an integer number (130199074525).

Almost surely, 2^520728390001 is an apocalyptic number.

It is an amenable number.

520728390001 is a deficient number, since it is larger than the sum of its proper divisors (67908099).

520728390001 is an equidigital number, since it uses as much as digits as its factorization.

520728390001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67908098.

The product of its (nonzero) digits is 30240, while the sum is 37.

The spelling of 520728390001 in words is "five hundred twenty billion, seven hundred twenty-eight million, three hundred ninety thousand, one".