509247640 has 32 divisors (see below), whose sum is σ = 1249972560. Its totient is φ = 185180800.

The previous prime is 509247611. The next prime is 509247643. The reversal of 509247640 is 46742905.

It is a self number, because there is not a number n which added to its sum of digits gives 509247640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509247643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 578251 + ... + 579130.

Almost surely, 2^509247640 is an apocalyptic number.

It is an amenable number.

509247640 is an abundant number, since it is smaller than the sum of its proper divisors (740724920).

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

509247640 is a wasteful number, since it uses less digits than its factorization.

509247640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157403 (or 1157399 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 509247640 is about 22566.5159029922. The cubic root of 509247640 is about 798.5639027401.

It can be divided in two parts, 50924 and 7640, that added together give a square (58564 = 242²).

The spelling of 509247640 in words is "five hundred nine million, two hundred forty-seven thousand, six hundred forty".