551611728 has 80 divisors (see below), whose sum is σ = 1586674240. Its totient is φ = 183482496.

The previous prime is 551611727. The next prime is 551611747. The reversal of 551611728 is 827116155.

551611728 is a `hidden beast` number, since 5 + 516 + 117 + 28 = 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 = 551611692 and 551611701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551611721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263775 + ... + 265857.

It is an arithmetic number, because the mean of its divisors is an integer number (19833428).

Almost surely, 2^551611728 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 551611728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (793337120).

551611728 is an abundant number, since it is smaller than the sum of its proper divisors (1035062512).

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

551611728 is a wasteful number, since it uses less digits than its factorization.

551611728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2713 (or 2701 counting only the distinct ones).

The product of its digits is 16800, while the sum is 36.

The square root of 551611728 is about 23486.4158185109. The cubic root of 551611728 is about 820.1208071069.

The spelling of 551611728 in words is "five hundred fifty-one million, six hundred eleven thousand, seven hundred twenty-eight".