5661440 has 36 divisors (see below), whose sum is σ = 13563984. Its totient is φ = 2264064.

The previous prime is 5661421. The next prime is 5661451. The reversal of 5661440 is 441665.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 932 + ... + 3491.

Almost surely, 2^5661440 is an apocalyptic number.

It is an amenable number.

5661440 is an abundant number, since it is smaller than the sum of its proper divisors (7902544).

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

5661440 is an equidigital number, since it uses as much as digits as its factorization.

5661440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444 (or 4430 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 5661440 is about 2379.3780700006. The cubic root of 5661440 is about 178.2278779869.

The spelling of 5661440 in words is "five million, six hundred sixty-one thousand, four hundred forty".