551267640 has 384 divisors, whose sum is σ = 2334355200. Its totient is φ = 114428160.

The previous prime is 551267623. The next prime is 551267659. The reversal of 551267640 is 46762155.

It is a happy number.

551267640 is a `hidden beast` number, since 5 + 5 + 1 + 2 + 6 + 7 + 640 = 666.

551267640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×551267640² = 607792021822339200, which contains 22 as substring.

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 = 551267595 and 551267604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 581647 + ... + 582593.

It is an arithmetic number, because the mean of its divisors is an integer number (6079050).

Almost surely, 2^551267640 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 551267640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1167177600).

551267640 is an abundant number, since it is smaller than the sum of its proper divisors (1783087560).

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

551267640 is a wasteful number, since it uses less digits than its factorization.

551267640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 992 (or 975 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 551267640 is about 23479.0894201628. The cubic root of 551267640 is about 819.9502448494.

The spelling of 551267640 in words is "five hundred fifty-one million, two hundred sixty-seven thousand, six hundred forty".