7747138706 has 8 divisors (see below), whose sum is σ = 12021422220. Its totient is φ = 3739997968.

The previous prime is 7747138681. The next prime is 7747138709. The reversal of 7747138706 is 6078317477.

It can be written as a sum of positive squares in 2 ways, for example, as 7605409681 + 141729025 = 87209^2 + 11905^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (7747138709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66785621 + ... + 66785736.

Almost surely, 2^7747138706 is an apocalyptic number.

7747138706 is a deficient number, since it is larger than the sum of its proper divisors (4274283514).

7747138706 is a wasteful number, since it uses less digits than its factorization.

7747138706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133571388.

The product of its (nonzero) digits is 1382976, while the sum is 50.

The square root of 7747138706 is about 88017.8317501630. The cubic root of 7747138706 is about 1978.7022331092.

The spelling of 7747138706 in words is "seven billion, seven hundred forty-seven million, one hundred thirty-eight thousand, seven hundred six".