6690624 has 28 divisors (see below), whose sum is σ = 17702784. Its totient is φ = 2230144.

The previous prime is 6690623. The next prime is 6690643. The reversal of 6690624 is 4260966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6690623) 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, 17232 + ... + 17615.

Almost surely, 2^6690624 is an apocalyptic number.

6690624 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6690624 is an abundant number, since it is smaller than the sum of its proper divisors (11012160).

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

6690624 is a wasteful number, since it uses less digits than its factorization.

6690624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34862 (or 34852 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 6690624 is about 2586.6240546318. The cubic root of 6690624 is about 188.4323833967.

The spelling of 6690624 in words is "six million, six hundred ninety thousand, six hundred twenty-four".