549000000 has 294 divisors, whose sum is σ = 1999232222. Its totient is φ = 144000000.

The previous prime is 548999999. The next prime is 549000013. The reversal of 549000000 is 945.

It can be written as a sum of positive squares in 7 ways, for example, as 489648384 + 59351616 = 22128^2 + 7704^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 8999970 + ... + 9000030.

Almost surely, 2^549000000 is an apocalyptic number.

549000000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 549000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999616111).

549000000 is an abundant number, since it is smaller than the sum of its proper divisors (1450232222).

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

549000000 is an frugal number, since it uses more digits than its factorization.

549000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 549000000 is about 23430.7490277200. The cubic root of 549000000 is about 818.8244110060.

Adding to 549000000 its reverse (945), we get a palindrome (549000945).

The spelling of 549000000 in words is "five hundred forty-nine million", and thus it is an aban number.