551628918 has 48 divisors (see below), whose sum is σ = 1249447680. Its totient is φ = 175559472.

The previous prime is 551628899. The next prime is 551628947. The reversal of 551628918 is 819826155.

It is a happy number.

551628918 is a `hidden beast` number, since 5 + 5 + 1 + 628 + 9 + 18 = 666.

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, 339913 + ... + 341531.

It is an arithmetic number, because the mean of its divisors is an integer number (26030160).

Almost surely, 2^551628918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551628918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (624723840).

551628918 is an abundant number, since it is smaller than the sum of its proper divisors (697818762).

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

551628918 is a wasteful number, since it uses less digits than its factorization.

551628918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473 (or 2470 counting only the distinct ones).

The product of its digits is 172800, while the sum is 45.

The square root of 551628918 is about 23486.7817718818. The cubic root of 551628918 is about 820.1293262213.

The spelling of 551628918 in words is "five hundred fifty-one million, six hundred twenty-eight thousand, nine hundred eighteen".