551664 has 40 divisors (see below), whose sum is σ = 1584720. Its totient is φ = 183744.

The previous prime is 551659. The next prime is 551671. The reversal of 551664 is 466155.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207 + ... + 1070.

It is an arithmetic number, because the mean of its divisors is an integer number (39618).

2⁵⁵¹⁶⁶⁴ is an apocalyptic number.

551664 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

551664 is an abundant number, since it is smaller than the sum of its proper divisors (1033056).

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

551664 is a wasteful number, since it uses less digits than its factorization.

551664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294 (or 1282 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 551664 is about 742.7408700213. The cubic root of 551664 is about 82.0146711802.

The spelling of 551664 in words is "five hundred fifty-one thousand, six hundred sixty-four".