6779640 has 96 divisors (see below), whose sum is σ = 23680080. Its totient is φ = 1548288.

The previous prime is 6779639. The next prime is 6779653. The reversal of 6779640 is 469776.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5304 + ... + 6456.

Almost surely, 2^6779640 is an apocalyptic number.

6779640 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 6779640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11840040).

6779640 is an abundant number, since it is smaller than the sum of its proper divisors (16900440).

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

6779640 is a wasteful number, since it uses less digits than its factorization.

6779640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181 (or 1170 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 6779640 is about 2603.7741837571. The cubic root of 6779640 is about 189.2643762415.

The spelling of 6779640 in words is "six million, seven hundred seventy-nine thousand, six hundred forty".