6999778680 has 64 divisors (see below), whose sum is σ = 21150460800. Its totient is φ = 1853174400.

The previous prime is 6999778673. The next prime is 6999778789. The reversal of 6999778680 is 868779996.

It is a congruent number.

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, 193146 + ... + 226505.

It is an arithmetic number, because the mean of its divisors is an integer number (330475950).

Almost surely, 2^6999778680 is an apocalyptic number.

6999778680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6999778680 is an abundant number, since it is smaller than the sum of its proper divisors (14150682120).

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

6999778680 is a wasteful number, since it uses less digits than its factorization.

6999778680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419804 (or 419800 counting only the distinct ones).

The product of its (nonzero) digits is 82301184, while the sum is 69.

The square root of 6999778680 is about 83664.6800029738. The cubic root of 6999778680 is about 1912.9110220871.

The spelling of 6999778680 in words is "six billion, nine hundred ninety-nine million, seven hundred seventy-eight thousand, six hundred eighty".