6547440 has 40 divisors (see below), whose sum is σ = 20297808. Its totient is φ = 1745920.

The previous prime is 6547427. The next prime is 6547447. The reversal of 6547440 is 447456.

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 6547398 and 6547407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6547447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13401 + ... + 13880.

Almost surely, 2^6547440 is an apocalyptic number.

6547440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6547440 is an abundant number, since it is smaller than the sum of its proper divisors (13750368).

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

6547440 is a wasteful number, since it uses less digits than its factorization.

6547440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27297 (or 27291 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 6547440 is about 2558.7965921503. The cubic root of 6547440 is about 187.0784842183.

The spelling of 6547440 in words is "six million, five hundred forty-seven thousand, four hundred forty".