5661778 has 16 divisors (see below), whose sum is σ = 8937216. Its totient is φ = 2686320.

The previous prime is 5661743. The next prime is 5661779. The reversal of 5661778 is 8771665.

It is a self number, because there is not a number n which added to its sum of digits gives 5661778.

It is not an unprimeable number, because it can be changed into a prime (5661779) 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, 2425 + ... + 4147.

It is an arithmetic number, because the mean of its divisors is an integer number (558576).

Almost surely, 2^5661778 is an apocalyptic number.

5661778 is a deficient number, since it is larger than the sum of its proper divisors (3275438).

5661778 is a wasteful number, since it uses less digits than its factorization.

5661778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809.

The product of its digits is 70560, while the sum is 40.

The square root of 5661778 is about 2379.4490959043. The cubic root of 5661778 is about 178.2314247774.

The spelling of 5661778 in words is "five million, six hundred sixty-one thousand, seven hundred seventy-eight".