68159920 has 40 divisors (see below), whose sum is σ = 162761904. Its totient is φ = 26525952.

The previous prime is 68159899. The next prime is 68159939. The reversal of 68159920 is 2995186.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8554 + ... + 14473.

Almost surely, 2^68159920 is an apocalyptic number.

It is an amenable number.

68159920 is an abundant number, since it is smaller than the sum of its proper divisors (94601984).

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

68159920 is a wasteful number, since it uses less digits than its factorization.

68159920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23077 (or 23071 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 68159920 is about 8255.9021312029. The cubic root of 68159920 is about 408.4852294348.

The spelling of 68159920 in words is "sixty-eight million, one hundred fifty-nine thousand, nine hundred twenty".