6909749678 has 32 divisors (see below), whose sum is σ = 11339274240. Its totient is φ = 3138599520.

The previous prime is 6909749669. The next prime is 6909749683. The reversal of 6909749678 is 8769479096.

It is a super-2 number, since 2×6909749678² = 95489281225242207368, which contains 22 as substring.

It is a Curzon number.

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, 1139651 + ... + 1145697.

It is an arithmetic number, because the mean of its divisors is an integer number (354352320).

Almost surely, 2^6909749678 is an apocalyptic number.

6909749678 is a deficient number, since it is larger than the sum of its proper divisors (4429524562).

6909749678 is a wasteful number, since it uses less digits than its factorization.

6909749678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6752.

The product of its (nonzero) digits is 41150592, while the sum is 65.

The square root of 6909749678 is about 83124.9040781401. The cubic root of 6909749678 is about 1904.6745174984.

The spelling of 6909749678 in words is "six billion, nine hundred nine million, seven hundred forty-nine thousand, six hundred seventy-eight".