6906939664 has 45 divisors (see below), whose sum is σ = 13605465783. Its totient is φ = 3396790176.

The previous prime is 6906939653. The next prime is 6906939667. The reversal of 6906939664 is 4669396096.

The square root of 6906939664 is 83108.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6906939599 and 6906939608.

It is not an unprimeable number, because it can be changed into a prime (6906939667) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26261997 + ... + 26262259.

Almost surely, 2^6906939664 is an apocalyptic number.

6906939664 is the 83108-th square number.

It is an amenable number.

6906939664 is a deficient number, since it is larger than the sum of its proper divisors (6698526119).

6906939664 is an frugal number, since it uses more digits than its factorization.

6906939664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692 (or 344 counting only the distinct ones).

The product of its (nonzero) digits is 11337408, while the sum is 58.

The cubic root of 6906939664 is about 1904.4162887636.

The spelling of 6906939664 in words is "six billion, nine hundred six million, nine hundred thirty-nine thousand, six hundred sixty-four".