68869640 has 32 divisors (see below), whose sum is σ = 177094080. Its totient is φ = 23612352.

The previous prime is 68869637. The next prime is 68869643. The reversal of 68869640 is 4696886.

It is an interprime number because it is at equal distance from previous prime (68869637) and next prime (68869643).

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (68869643) 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 7 ways as a sum of consecutive naturals, for example, 122702 + ... + 123261.

It is an arithmetic number, because the mean of its divisors is an integer number (5534190).

Almost surely, 2^68869640 is an apocalyptic number.

It is an amenable number.

68869640 is an abundant number, since it is smaller than the sum of its proper divisors (108224440).

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

68869640 is a wasteful number, since it uses less digits than its factorization.

68869640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245981 (or 245977 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 68869640 is about 8298.7734033410. The cubic root of 68869640 is about 409.8981305510.

The spelling of 68869640 in words is "sixty-eight million, eight hundred sixty-nine thousand, six hundred forty".