551368440 has 96 divisors (see below), whose sum is σ = 2047949280. Its totient is φ = 126026496.

The previous prime is 551368417. The next prime is 551368469. The reversal of 551368440 is 44863155.

It is a happy number.

551368440 is a `hidden beast` number, since 551 + 3 + 68 + 4 + 40 = 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 = 551368395 and 551368404.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106879 + ... + 111918.

It is an arithmetic number, because the mean of its divisors is an integer number (21332805).

Almost surely, 2^551368440 is an apocalyptic number.

It is an amenable number.

551368440 is an abundant number, since it is smaller than the sum of its proper divisors (1496580840).

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

551368440 is a wasteful number, since it uses less digits than its factorization.

551368440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218821 (or 218814 counting only the distinct ones).

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

The square root of 551368440 is about 23481.2359129582. The cubic root of 551368440 is about 820.0002181241. Note that the first 3 decimals are identical.

The spelling of 551368440 in words is "five hundred fifty-one million, three hundred sixty-eight thousand, four hundred forty".