549446640 has 80 divisors (see below), whose sum is σ = 1706215200. Its totient is φ = 146267136.

The previous prime is 549446627. The next prime is 549446657. The reversal of 549446640 is 46644945.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×549446640² = 603783220414579200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 549446592 and 549446601.

It is a congruent number.

It is an unprimeable number.

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, 168546 + ... + 171774.

It is an arithmetic number, because the mean of its divisors is an integer number (21327690).

Almost surely, 2^549446640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 549446640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (853107600).

549446640 is an abundant number, since it is smaller than the sum of its proper divisors (1156768560).

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

549446640 is a wasteful number, since it uses less digits than its factorization.

549446640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3954 (or 3948 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The square root of 549446640 is about 23440.2781553462. The cubic root of 549446640 is about 819.0464028715.

The spelling of 549446640 in words is "five hundred forty-nine million, four hundred forty-six thousand, six hundred forty".