6447740 has 24 divisors (see below), whose sum is σ = 14582400. Its totient is φ = 2380608.

The previous prime is 6447737. The next prime is 6447757. The reversal of 6447740 is 477446.

It is a super-2 number, since 2×6447740² = 83146702215200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6447697 and 6447706.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12140 + ... + 12659.

It is an arithmetic number, because the mean of its divisors is an integer number (607600).

Almost surely, 2^6447740 is an apocalyptic number.

It is an amenable number.

6447740 is an abundant number, since it is smaller than the sum of its proper divisors (8134660).

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

6447740 is a wasteful number, since it uses less digits than its factorization.

6447740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24821 (or 24819 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 32.

The square root of 6447740 is about 2539.2400437926. The cubic root of 6447740 is about 186.1240549070.

The spelling of 6447740 in words is "six million, four hundred forty-seven thousand, seven hundred forty".