68405920 has 48 divisors (see below), whose sum is σ = 176305248. Its totient is φ = 24874240.

The previous prime is 68405903. The next prime is 68405921. The reversal of 68405920 is 2950486.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (68405921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17674 + ... + 21193.

It is an arithmetic number, because the mean of its divisors is an integer number (3673026).

Almost surely, 2^68405920 is an apocalyptic number.

It is an amenable number.

68405920 is an abundant number, since it is smaller than the sum of its proper divisors (107899328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68405920 is a wasteful number, since it uses less digits than its factorization.

68405920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38893 (or 38885 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 68405920 is about 8270.7871451271. The cubic root of 68405920 is about 408.9760688050.

The spelling of 68405920 in words is "sixty-eight million, four hundred five thousand, nine hundred twenty".