551683440 has 640 divisors, whose sum is σ = 2468413440. Its totient is φ = 109900800.

The previous prime is 551683423. The next prime is 551683441. The reversal of 551683440 is 44386155.

It is a happy number.

551683440 is a `hidden beast` number, since 55 + 168 + 3 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 551683395 and 551683404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551683441) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5155867 + ... + 5155973.

It is an arithmetic number, because the mean of its divisors is an integer number (3856896).

Almost surely, 2^551683440 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 551683440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1234206720).

551683440 is an abundant number, since it is smaller than the sum of its proper divisors (1916730000).

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

551683440 is a wasteful number, since it uses less digits than its factorization.

551683440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 551683440 is about 23487.9424386216. The cubic root of 551683440 is about 820.1563453620.

The spelling of 551683440 in words is "five hundred fifty-one million, six hundred eighty-three thousand, four hundred forty".