68445840 has 40 divisors (see below), whose sum is σ = 212182848. Its totient is φ = 18252160.

The previous prime is 68445827. The next prime is 68445857. The reversal of 68445840 is 4854486.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142356 + ... + 142835.

Almost surely, 2^68445840 is an apocalyptic number.

68445840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68445840 is an abundant number, since it is smaller than the sum of its proper divisors (143737008).

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

68445840 is a wasteful number, since it uses less digits than its factorization.

68445840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285207 (or 285201 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 39.

The square root of 68445840 is about 8273.2001063675. The cubic root of 68445840 is about 409.0556094345.

The spelling of 68445840 in words is "sixty-eight million, four hundred forty-five thousand, eight hundred forty".