68909906 has 8 divisors (see below), whose sum is σ = 111316044. Its totient is φ = 31804560.

The previous prime is 68909851. The next prime is 68909921. The reversal of 68909906 is 60990986.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 68475625 + 434281 = 8275^2 + 659^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1325165 + ... + 1325216.

Almost surely, 2^68909906 is an apocalyptic number.

68909906 is a deficient number, since it is larger than the sum of its proper divisors (42406138).

68909906 is a wasteful number, since it uses less digits than its factorization.

68909906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2650396.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 68909906 is about 8301.1990700139. The cubic root of 68909906 is about 409.9780000093.

The spelling of 68909906 in words is "sixty-eight million, nine hundred nine thousand, nine hundred six".