6534840 has 128 divisors (see below), whose sum is σ = 21772800. Its totient is φ = 1559040.

The previous prime is 6534823. The next prime is 6534859. The reversal of 6534840 is 484356.

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

It is a junction number, because it is equal to n+sod(n) for n = 6534798 and 6534807.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92005 + ... + 92075.

It is an arithmetic number, because the mean of its divisors is an integer number (170100).

Almost surely, 2^6534840 is an apocalyptic number.

6534840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6534840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10886400).

6534840 is an abundant number, since it is smaller than the sum of its proper divisors (15237960).

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

6534840 is a wasteful number, since it uses less digits than its factorization.

6534840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 6534840 is about 2556.3333116008. Note that the first 4 decimals coincide. The cubic root of 6534840 is about 186.9584015299.

The spelling of 6534840 in words is "six million, five hundred thirty-four thousand, eight hundred forty".