68921408 has 28 divisors (see below), whose sum is σ = 137152380. Its totient is φ = 34363392.

The previous prime is 68921407. The next prime is 68921441. The reversal of 68921408 is 80412986.

It can be written as a sum of positive squares in 2 ways, for example, as 38539264 + 30382144 = 6208^2 + 5512^2 .

It is not an unprimeable number, because it can be changed into a prime (68921407) 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, 24860 + ... + 27492.

Almost surely, 2^68921408 is an apocalyptic number.

It is an amenable number.

68921408 is a deficient number, since it is larger than the sum of its proper divisors (68230972).

68921408 is a wasteful number, since it uses less digits than its factorization.

68921408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3054 (or 3044 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 68921408 is about 8301.8918325885. The cubic root of 68921408 is about 410.0008090406. Note that the first 3 decimals are identical.

The spelling of 68921408 in words is "sixty-eight million, nine hundred twenty-one thousand, four hundred eight".