551442640 has 80 divisors (see below), whose sum is σ = 1469370240. Its totient is φ = 188536320.

The previous prime is 551442637. The next prime is 551442659. The reversal of 551442640 is 46244155.

It is a happy number.

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

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 234591 + ... + 236929.

It is an arithmetic number, because the mean of its divisors is an integer number (18367128).

Almost surely, 2^551442640 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 551442640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (734685120).

551442640 is an abundant number, since it is smaller than the sum of its proper divisors (917927600).

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

551442640 is a wasteful number, since it uses less digits than its factorization.

551442640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2780 (or 2774 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 551442640 is about 23482.8158447832. The cubic root of 551442640 is about 820.0370001151.

Adding to 551442640 its reverse (46244155), we get a palindrome (597686795).

The spelling of 551442640 in words is "five hundred fifty-one million, four hundred forty-two thousand, six hundred forty".