6879640 has 32 divisors (see below), whose sum is σ = 15558480. Its totient is φ = 2737792.

The previous prime is 6879589. The next prime is 6879643. The reversal of 6879640 is 469786.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 6879593 and 6879602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6879643) 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, 11427 + ... + 12013.

Almost surely, 2^6879640 is an apocalyptic number.

It is an amenable number.

6879640 is an abundant number, since it is smaller than the sum of its proper divisors (8678840).

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

6879640 is a wasteful number, since it uses less digits than its factorization.

6879640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891 (or 887 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 6879640 is about 2622.9067844664. The cubic root of 6879640 is about 190.1903908712.

6879640 divided by its sum of digits (40) gives a triangular number (171991 = T₅₈₆).

The spelling of 6879640 in words is "six million, eight hundred seventy-nine thousand, six hundred forty".