68445040 has 40 divisors (see below), whose sum is σ = 159878160. Its totient is φ = 27250176.

The previous prime is 68445029. The next prime is 68445053. The reversal of 68445040 is 4054486.

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

It is a junction number, because it is equal to n+sod(n) for n = 68444993 and 68445011.

It is a congruent number.

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, 16276 + ... + 20044.

It is an arithmetic number, because the mean of its divisors is an integer number (3996954).

Almost surely, 2^68445040 is an apocalyptic number.

It is an amenable number.

68445040 is an abundant number, since it is smaller than the sum of its proper divisors (91433120).

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

68445040 is a wasteful number, since it uses less digits than its factorization.

68445040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4009 (or 4003 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 68445040 is about 8273.1517573413. The cubic root of 68445040 is about 409.0540157376.

The spelling of 68445040 in words is "sixty-eight million, four hundred forty-five thousand, forty".