520779780 has 60 divisors (see below), whose sum is σ = 1633710540. Its totient is φ = 138874176.

The previous prime is 520779733. The next prime is 520779793. The reversal of 520779780 is 87977025.

It can be written as a sum of positive squares in 2 ways, for example, as 356529924 + 164249856 = 18882^2 + 12816^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 159115 + ... + 162354.

It is an arithmetic number, because the mean of its divisors is an integer number (27228509).

Almost surely, 2^520779780 is an apocalyptic number.

It is an amenable number.

520779780 is an abundant number, since it is smaller than the sum of its proper divisors (1112930760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

520779780 is a wasteful number, since it uses less digits than its factorization.

520779780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321490 (or 321479 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 520779780 is about 22820.5999044723. The cubic root of 520779780 is about 804.5469101329.

The spelling of 520779780 in words is "five hundred twenty million, seven hundred seventy-nine thousand, seven hundred eighty".