6551604 has 60 divisors (see below), whose sum is σ = 17424484. Its totient is φ = 2146176.

The previous prime is 6551603. The next prime is 6551639. The reversal of 6551604 is 4061556.

It is a happy number.

6551604 is a `hidden beast` number, since 6 + 5 + 51 + 604 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2340900 + 4210704 = 1530^2 + 2052^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6551603) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 23514 + ... + 23790.

Almost surely, 2^6551604 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 6551604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8712242).

6551604 is an abundant number, since it is smaller than the sum of its proper divisors (10872880).

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

6551604 is a wasteful number, since it uses less digits than its factorization.

6551604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 355 counting only the distinct ones).

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

The square root of 6551604 is about 2559.6101265622. The cubic root of 6551604 is about 187.1181348159.

The spelling of 6551604 in words is "six million, five hundred fifty-one thousand, six hundred four".