5661920 has 48 divisors (see below), whose sum is σ = 14596848. Its totient is φ = 2058240.

The previous prime is 5661911. The next prime is 5661923. The reversal of 5661920 is 291665.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152 + ... + 3368.

It is an arithmetic number, because the mean of its divisors is an integer number (304101).

Almost surely, 2^5661920 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 5661920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7298424).

5661920 is an abundant number, since it is smaller than the sum of its proper divisors (8934928).

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

5661920 is a wasteful number, since it uses less digits than its factorization.

5661920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3243 (or 3235 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 5661920 is about 2379.4789345569. The cubic root of 5661920 is about 178.2329148070.

The spelling of 5661920 in words is "five million, six hundred sixty-one thousand, nine hundred twenty".