520779545 has 32 divisors (see below), whose sum is σ = 736646400. Its totient is φ = 348445440.

The previous prime is 520779529. The next prime is 520779559. The reversal of 520779545 is 545977025.

It is not a de Polignac number, because 520779545 - 2⁴ = 520779529 is a prime.

It is a super-2 number, since 2×520779545² = 542422668980814050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 520779496 and 520779505.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 248492 + ... + 250578.

It is an arithmetic number, because the mean of its divisors is an integer number (23020200).

Almost surely, 2^520779545 is an apocalyptic number.

520779545 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

520779545 is a deficient number, since it is larger than the sum of its proper divisors (215866855).

520779545 is a wasteful number, since it uses less digits than its factorization.

520779545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465.

The product of its (nonzero) digits is 441000, while the sum is 44.

The square root of 520779545 is about 22820.5947556149. The cubic root of 520779545 is about 804.5467891166.

The spelling of 520779545 in words is "five hundred twenty million, seven hundred seventy-nine thousand, five hundred forty-five".