68640575 has 12 divisors (see below), whose sum is σ = 85690200. Its totient is φ = 54540960.

The previous prime is 68640571. The next prime is 68640581. The reversal of 68640575 is 57504686.

It is not a de Polignac number, because 68640575 - 2² = 68640571 is a prime.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68640571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5489 + ... + 12938.

It is an arithmetic number, because the mean of its divisors is an integer number (7140850).

Almost surely, 2^68640575 is an apocalyptic number.

68640575 is a deficient number, since it is larger than the sum of its proper divisors (17049625).

68640575 is a wasteful number, since it uses less digits than its factorization.

68640575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18586 (or 18581 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The square root of 68640575 is about 8284.9607723875. The cubic root of 68640575 is about 409.4431762996.

The spelling of 68640575 in words is "sixty-eight million, six hundred forty thousand, five hundred seventy-five".