5663994 has 16 divisors (see below), whose sum is σ = 12946368. Its totient is φ = 1618272.

The previous prime is 5663993. The next prime is 5664011. The reversal of 5663994 is 4993665.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 134857 = 5663994 / (5 + 6 + 6 + 3 + 9 + 9 + 4).

It is a d-powerful number, because it can be written as 5⁷ + 6⁴ + 6⁵ + 3⁵ + 9⁶ + 9⁷ + 4⁹ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5663993) 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, 67387 + ... + 67470.

It is an arithmetic number, because the mean of its divisors is an integer number (809148).

Almost surely, 2^5663994 is an apocalyptic number.

5663994 is an abundant number, since it is smaller than the sum of its proper divisors (7282374).

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

5663994 is a wasteful number, since it uses less digits than its factorization.

5663994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134869.

The product of its digits is 174960, while the sum is 42.

The square root of 5663994 is about 2379.9147043539. The cubic root of 5663994 is about 178.2546747953.

It can be divided in two parts, 566 and 3994, that added together give a triangular number (4560 = T₉₅).

The spelling of 5663994 in words is "five million, six hundred sixty-three thousand, nine hundred ninety-four".