551456640 has 512 divisors, whose sum is σ = 2303078400. Its totient is φ = 122093568.

The previous prime is 551456623. The next prime is 551456641. The reversal of 551456640 is 46654155.

551456640 is a `hidden beast` number, since 5 + 5 + 1 + 4 + 5 + 6 + 640 = 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 = 551456595 and 551456604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551456641) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 5685072 + ... + 5685168.

It is an arithmetic number, because the mean of its divisors is an integer number (4498200).

Almost surely, 2^551456640 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 551456640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1151539200).

551456640 is an abundant number, since it is smaller than the sum of its proper divisors (1751621760).

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

551456640 is a wasteful number, since it uses less digits than its factorization.

551456640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The square root of 551456640 is about 23483.1139332074. The cubic root of 551456640 is about 820.0439397434.

The spelling of 551456640 in words is "five hundred fifty-one million, four hundred fifty-six thousand, six hundred forty".