549845640 has 48 divisors (see below), whose sum is σ = 1786999500. Its totient is φ = 146625408.

The previous prime is 549845633. The next prime is 549845651. The reversal of 549845640 is 46548945.

549845640 is a `hidden beast` number, since 5 + 4 + 9 + 84 + 564 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 547279236 + 2566404 = 23394^2 + 1602^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 763315 + ... + 764034.

Almost surely, 2^549845640 is an apocalyptic number.

It is an amenable number.

549845640 is an abundant number, since it is smaller than the sum of its proper divisors (1237153860).

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

549845640 is a wasteful number, since it uses less digits than its factorization.

549845640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527366 (or 1527359 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The square root of 549845640 is about 23448.7876019209. The cubic root of 549845640 is about 819.2446146827.

The spelling of 549845640 in words is "five hundred forty-nine million, eight hundred forty-five thousand, six hundred forty".