517256540 has 48 divisors (see below), whose sum is σ = 1112348160. Its totient is φ = 201979200.

The previous prime is 517256473. The next prime is 517256543. The reversal of 517256540 is 45652715.

It is a self number, because there is not a number n which added to its sum of digits gives 517256540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (517256543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176729 + ... + 179631.

It is an arithmetic number, because the mean of its divisors is an integer number (23173920).

Almost surely, 2^517256540 is an apocalyptic number.

It is an amenable number.

517256540 is an abundant number, since it is smaller than the sum of its proper divisors (595091620).

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

517256540 is a wasteful number, since it uses less digits than its factorization.

517256540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3122 (or 3120 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 517256540 is about 22743.2746103106. The cubic root of 517256540 is about 802.7284650191.

The spelling of 517256540 in words is "five hundred seventeen million, two hundred fifty-six thousand, five hundred forty".