6447690 has 48 divisors (see below), whose sum is σ = 17312256. Its totient is φ = 1663200.

The previous prime is 6447673. The next prime is 6447691. The reversal of 6447690 is 967446.

6447690 is a `hidden beast` number, since 644 + 7 + 6 + 9 + 0 = 666.

It is a super-2 number, since 2×6447690² = 83145412672200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6447691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1635 + ... + 3945.

It is an arithmetic number, because the mean of its divisors is an integer number (360672).

Almost surely, 2^6447690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6447690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8656128).

6447690 is an abundant number, since it is smaller than the sum of its proper divisors (10864566).

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

6447690 is a wasteful number, since it uses less digits than its factorization.

6447690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355 (or 2352 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 6447690 is about 2539.2301983081. The cubic root of 6447690 is about 186.1235737964.

The spelling of 6447690 in words is "six million, four hundred forty-seven thousand, six hundred ninety".