6688442 has 8 divisors (see below), whose sum is σ = 10069716. Its totient is φ = 3331872.

The previous prime is 6688433. The next prime is 6688457. The reversal of 6688442 is 2448866.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5148361 + 1540081 = 2269^2 + 1241^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 6688396 and 6688405.

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, 5483 + ... + 6590.

Almost surely, 2^6688442 is an apocalyptic number.

6688442 is a deficient number, since it is larger than the sum of its proper divisors (3381274).

6688442 is a wasteful number, since it uses less digits than its factorization.

6688442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12352.

The product of its digits is 73728, while the sum is 38.

The square root of 6688442 is about 2586.2022349383. The cubic root of 6688442 is about 188.4118968090.

It can be divided in two parts, 6688 and 442, that multiplied together give a triangular number (2956096 = T₂₄₃₁).

The spelling of 6688442 in words is "six million, six hundred eighty-eight thousand, four hundred forty-two".