6889640 has 32 divisors (see below), whose sum is σ = 15883560. Its totient is φ = 2688000.

The previous prime is 6889639. The next prime is 6889643. The reversal of 6889640 is 469886.

It can be written as a sum of positive squares in 4 ways, for example, as 1898884 + 4990756 = 1378^2 + 2234^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (6889643) 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, 461 + ... + 3740.

Almost surely, 2^6889640 is an apocalyptic number.

It is an amenable number.

6889640 is an abundant number, since it is smaller than the sum of its proper divisors (8993920).

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

6889640 is a wasteful number, since it uses less digits than its factorization.

6889640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4253 (or 4249 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 6889640 is about 2624.8123742470. The cubic root of 6889640 is about 190.2824975870.

The spelling of 6889640 in words is "six million, eight hundred eighty-nine thousand, six hundred forty".