5661738 has 20 divisors (see below), whose sum is σ = 12686850. Its totient is φ = 1887192.

The previous prime is 5661727. The next prime is 5661739. The reversal of 5661738 is 8371665.

5661738 is a `hidden beast` number, since 5 + 6 + 617 + 38 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5602689 + 59049 = 2367^2 + 243^2 .

It is not an unprimeable number, because it can be changed into a prime (5661739) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 17313 + ... + 17636.

Almost surely, 2^5661738 is an apocalyptic number.

5661738 is an abundant number, since it is smaller than the sum of its proper divisors (7025112).

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

5661738 is a wasteful number, since it uses less digits than its factorization.

5661738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34963 (or 34954 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 5661738 is about 2379.4406905826. The cubic root of 5661738 is about 178.2310050462.

It can be divided in two parts, 566 and 1738, that added together give a square (2304 = 48²).

The spelling of 5661738 in words is "five million, six hundred sixty-one thousand, seven hundred thirty-eight".