68921865 has 24 divisors (see below), whose sum is σ = 119670720. Its totient is φ = 36694944.

The previous prime is 68921863. The next prime is 68921921. The reversal of 68921865 is 56812986.

It is not a de Polignac number, because 68921865 - 2¹ = 68921863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 68921865.

It is not an unprimeable number, because it can be changed into a prime (68921863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37764 + ... + 39546.

It is an arithmetic number, because the mean of its divisors is an integer number (4986280).

Almost surely, 2^68921865 is an apocalyptic number.

It is an amenable number.

68921865 is a deficient number, since it is larger than the sum of its proper divisors (50748855).

68921865 is a wasteful number, since it uses less digits than its factorization.

68921865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653 (or 2650 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 68921865 is about 8301.9193563898. The cubic root of 68921865 is about 410.0017152417.

The spelling of 68921865 in words is "sixty-eight million, nine hundred twenty-one thousand, eight hundred sixty-five".