531687660 has 48 divisors (see below), whose sum is σ = 1701401856. Its totient is φ = 121528512.

The previous prime is 531687623. The next prime is 531687661. The reversal of 531687660 is 66786135.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (531687661) 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, 632542 + ... + 633381.

It is an arithmetic number, because the mean of its divisors is an integer number (35445872).

Almost surely, 2^531687660 is an apocalyptic number.

It is an amenable number.

531687660 is an abundant number, since it is smaller than the sum of its proper divisors (1169714196).

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

531687660 is a wasteful number, since it uses less digits than its factorization.

531687660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1265942 (or 1265940 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 531687660 is about 23058.3533670555. The cubic root of 531687660 is about 810.1252968799.

The spelling of 531687660 in words is "five hundred thirty-one million, six hundred eighty-seven thousand, six hundred sixty".