6999979770 has 384 divisors, whose sum is σ = 22604832000. Its totient is φ = 1535998464.

The previous prime is 6999979729. The next prime is 6999979771. The reversal of 6999979770 is 779799996.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6999979771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 46979656 + ... + 46979804.

It is an arithmetic number, because the mean of its divisors is an integer number (58866750).

Almost surely, 2^6999979770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6999979770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11302416000).

6999979770 is an abundant number, since it is smaller than the sum of its proper divisors (15604852230).

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

6999979770 is a wasteful number, since it uses less digits than its factorization.

6999979770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 121522842, while the sum is 72.

The square root of 6999979770 is about 83665.8817559464. The cubic root of 6999979770 is about 1912.9293399802.

It can be divided in two parts, 69999 and 79770, that added together give a square (149769 = 387²).

The spelling of 6999979770 in words is "six billion, nine hundred ninety-nine million, nine hundred seventy-nine thousand, seven hundred seventy".