6689624 has 8 divisors (see below), whose sum is σ = 12543060. Its totient is φ = 3344808.

The previous prime is 6689623. The next prime is 6689629. The reversal of 6689624 is 4269866.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×6689624² = 89502138522752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 418094 + ... + 418109.

Almost surely, 2^6689624 is an apocalyptic number.

It is an amenable number.

6689624 is a deficient number, since it is larger than the sum of its proper divisors (5853436).

6689624 is a wasteful number, since it uses less digits than its factorization.

6689624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836209 (or 836205 counting only the distinct ones).

The product of its digits is 124416, while the sum is 41.

The square root of 6689624 is about 2586.4307452549. The cubic root of 6689624 is about 188.4229950461.

The spelling of 6689624 in words is "six million, six hundred eighty-nine thousand, six hundred twenty-four".