520345988 has 6 divisors (see below), whose sum is σ = 910605486. Its totient is φ = 260172992.

The previous prime is 520345963. The next prime is 520345993. The reversal of 520345988 is 889543025.

It can be written as a sum of positive squares in only one way, i.e., 466646404 + 53699584 = 21602^2 + 7328^2 .

It is a super-2 number, since 2×520345988² = 541519894455392288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65043245 + ... + 65043252.

It is an arithmetic number, because the mean of its divisors is an integer number (151767581).

Almost surely, 2^520345988 is an apocalyptic number.

It is an amenable number.

520345988 is a deficient number, since it is larger than the sum of its proper divisors (390259498).

520345988 is a wasteful number, since it uses less digits than its factorization.

520345988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130086501 (or 130086499 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 44.

The square root of 520345988 is about 22811.0935292458. The cubic root of 520345988 is about 804.3234612620.

The spelling of 520345988 in words is "five hundred twenty million, three hundred forty-five thousand, nine hundred eighty-eight".