6779579940 has 144 divisors (see below), whose sum is σ = 24885124992. Its totient is φ = 1458459648.

The previous prime is 6779579927. The next prime is 6779579941. The reversal of 6779579940 is 499759776.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (6779579941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 136834 + ... + 179673.

It is an arithmetic number, because the mean of its divisors is an integer number (172813368).

Almost surely, 2^6779579940 is an apocalyptic number.

6779579940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6779579940 is an abundant number, since it is smaller than the sum of its proper divisors (18105545052).

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

6779579940 is a wasteful number, since it uses less digits than its factorization.

6779579940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316546 (or 316541 counting only the distinct ones).

The product of its (nonzero) digits is 30005640, while the sum is 63.

The square root of 6779579940 is about 82338.2046197268. The cubic root of 6779579940 is about 1892.6381734991.

The spelling of 6779579940 in words is "six billion, seven hundred seventy-nine million, five hundred seventy-nine thousand, nine hundred forty".