6656040 has 64 divisors (see below), whose sum is σ = 22190400. Its totient is φ = 1774656.

The previous prime is 6656011. The next prime is 6656059. The reversal of 6656040 is 406566.

6656040 is a `hidden beast` number, since 6 + 656 + 0 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6655995 and 6656013.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2002 + ... + 4161.

It is an arithmetic number, because the mean of its divisors is an integer number (346725).

Almost surely, 2^6656040 is an apocalyptic number.

6656040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6656040 is an abundant number, since it is smaller than the sum of its proper divisors (15534360).

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

6656040 is a wasteful number, since it uses less digits than its factorization.

6656040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6183 (or 6173 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 6656040 is about 2579.9302316148. The cubic root of 6656040 is about 188.1071518334.

The spelling of 6656040 in words is "six million, six hundred fifty-six thousand, forty".