549998640 has 160 divisors (see below), whose sum is σ = 1916395200. Its totient is φ = 144967680.

The previous prime is 549998629. The next prime is 549998677. The reversal of 549998640 is 46899945.

549998640 is a `hidden beast` number, since 5 + 499 + 98 + 64 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190810 + ... + 193670.

It is an arithmetic number, because the mean of its divisors is an integer number (11977470).

Almost surely, 2^549998640 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 549998640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (958197600).

549998640 is an abundant number, since it is smaller than the sum of its proper divisors (1366396560).

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

549998640 is a wasteful number, since it uses less digits than its factorization.

549998640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2972 (or 2960 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 549998640 is about 23452.0498038018. The cubic root of 549998640 is about 819.3205952807.

The spelling of 549998640 in words is "five hundred forty-nine million, nine hundred ninety-eight thousand, six hundred forty".