6690432 has 128 divisors (see below), whose sum is σ = 21542400. Its totient is φ = 1797120.

The previous prime is 6690427. The next prime is 6690433. The reversal of 6690432 is 2340966.

It is a tau number, because it is divible by the number of its divisors (128).

It is a self number, because there is not a number n which added to its sum of digits gives 6690432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6690433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51007 + ... + 51137.

It is an arithmetic number, because the mean of its divisors is an integer number (168300).

Almost surely, 2^6690432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6690432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10771200).

6690432 is an abundant number, since it is smaller than the sum of its proper divisors (14851968).

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

6690432 is a wasteful number, since it uses less digits than its factorization.

6690432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 6690432 is about 2586.5869403521. The cubic root of 6690432 is about 188.4305809059.

The spelling of 6690432 in words is "six million, six hundred ninety thousand, four hundred thirty-two".