517256240 has 20 divisors (see below), whose sum is σ = 1202620944. Its totient is φ = 206902464.

The previous prime is 517256239. The next prime is 517256261. The reversal of 517256240 is 42652715.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 517256197 and 517256206.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3232772 + ... + 3232931.

Almost surely, 2^517256240 is an apocalyptic number.

It is an amenable number.

517256240 is an abundant number, since it is smaller than the sum of its proper divisors (685364704).

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

517256240 is a wasteful number, since it uses less digits than its factorization.

517256240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6465716 (or 6465710 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 517256240 is about 22743.2680149533. The cubic root of 517256240 is about 802.7283098294.

The spelling of 517256240 in words is "five hundred seventeen million, two hundred fifty-six thousand, two hundred forty".