540638660 has 24 divisors (see below), whose sum is σ = 1137046680. Its totient is φ = 215930624.

The previous prime is 540638617. The next prime is 540638663. The reversal of 540638660 is 66836045.

It can be written as a sum of positive squares in 4 ways, for example, as 145106116 + 395532544 = 12046^2 + 19888^2 .

It is not an unprimeable number, because it can be changed into a prime (540638663) 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, 6425 + ... + 33504.

It is an arithmetic number, because the mean of its divisors is an integer number (47376945).

Almost surely, 2^540638660 is an apocalyptic number.

It is an amenable number.

540638660 is an abundant number, since it is smaller than the sum of its proper divisors (596408020).

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

540638660 is a wasteful number, since it uses less digits than its factorization.

540638660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40615 (or 40613 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 540638660 is about 23251.6377917772. The cubic root of 540638660 is about 814.6461936753.

The spelling of 540638660 in words is "five hundred forty million, six hundred thirty-eight thousand, six hundred sixty".