6447960 has 48 divisors (see below), whose sum is σ = 20957040. Its totient is φ = 1719360.

The previous prime is 6447943. The next prime is 6447967. The reversal of 6447960 is 697446.

6447960 is a `hidden beast` number, since 644 + 7 + 9 + 6 + 0 = 666.

It is a Smith number, since the sum of its digits (36) 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 (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6447967) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8596 + ... + 9315.

It is an arithmetic number, because the mean of its divisors is an integer number (436605).

Almost surely, 2^6447960 is an apocalyptic number.

6447960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6447960 is an abundant number, since it is smaller than the sum of its proper divisors (14509080).

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

6447960 is a wasteful number, since it uses less digits than its factorization.

6447960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17928 (or 17921 counting only the distinct ones).

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

The square root of 6447960 is about 2539.2833634709. The cubic root of 6447960 is about 186.1261717637.

The spelling of 6447960 in words is "six million, four hundred forty-seven thousand, nine hundred sixty".