6688992 has 24 divisors (see below), whose sum is σ = 17558856. Its totient is φ = 2229632.

The previous prime is 6688967. The next prime is 6688999. The reversal of 6688992 is 2998866.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×6688992² = 89485227952128, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6688999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34743 + ... + 34934.

It is an arithmetic number, because the mean of its divisors is an integer number (731619).

Almost surely, 2^6688992 is an apocalyptic number.

It is an amenable number.

6688992 is an abundant number, since it is smaller than the sum of its proper divisors (10869864).

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

6688992 is a wasteful number, since it uses less digits than its factorization.

6688992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69690 (or 69682 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 6688992 is about 2586.3085662774. The cubic root of 6688992 is about 188.4170611259.

The spelling of 6688992 in words is "six million, six hundred eighty-eight thousand, nine hundred ninety-two".