68240864 has 24 divisors (see below), whose sum is σ = 134800848. Its totient is φ = 34005760.

The previous prime is 68240863. The next prime is 68240891. The reversal of 68240864 is 46804286.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68240863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6524 + ... + 13380.

It is an arithmetic number, because the mean of its divisors is an integer number (5616702).

Almost surely, 2^68240864 is an apocalyptic number.

It is an amenable number.

68240864 is a deficient number, since it is larger than the sum of its proper divisors (66559984).

68240864 is a wasteful number, since it uses less digits than its factorization.

68240864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7178 (or 7170 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 68240864 is about 8260.8028665500. The cubic root of 68240864 is about 408.6468657179.

The spelling of 68240864 in words is "sixty-eight million, two hundred forty thousand, eight hundred sixty-four".