550887840 has 144 divisors (see below), whose sum is σ = 1892243808. Its totient is φ = 145939968.

The previous prime is 550887829. The next prime is 550887847. The reversal of 550887840 is 48788055.

It is a Cunningham number, because it is equal to 23471²-1.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is not an unprimeable number, because it can be changed into a prime (550887847) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 233547 + ... + 235893.

It is an arithmetic number, because the mean of its divisors is an integer number (13140582).

Almost surely, 2^550887840 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 550887840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (946121904).

550887840 is an abundant number, since it is smaller than the sum of its proper divisors (1341355968).

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

550887840 is a wasteful number, since it uses less digits than its factorization.

550887840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531 (or 2520 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The square root of 550887840 is about 23470.9999786971. Note that the first 4 decimals coincide. The cubic root of 550887840 is about 819.7618979525.

The spelling of 550887840 in words is "five hundred fifty million, eight hundred eighty-seven thousand, eight hundred forty".