5661520 has 20 divisors (see below), whose sum is σ = 13163220. Its totient is φ = 2264576.

The previous prime is 5661517. The next prime is 5661521. The reversal of 5661520 is 251665.

It can be written as a sum of positive squares in 2 ways, for example, as 3779136 + 1882384 = 1944^2 + 1372^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35305 + ... + 35464.

It is an arithmetic number, because the mean of its divisors is an integer number (658161).

Almost surely, 2^5661520 is an apocalyptic number.

It is an amenable number.

5661520 is an abundant number, since it is smaller than the sum of its proper divisors (7501700).

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

5661520 is a wasteful number, since it uses less digits than its factorization.

5661520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70782 (or 70776 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 5661520 is about 2379.3948810569. The cubic root of 5661520 is about 178.2287174767.

The spelling of 5661520 in words is "five million, six hundred sixty-one thousand, five hundred twenty".