68887640 has 16 divisors (see below), whose sum is σ = 154997280. Its totient is φ = 27555040.

The previous prime is 68887619. The next prime is 68887649. The reversal of 68887640 is 4678886.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68887649) 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, 861056 + ... + 861135.

It is an arithmetic number, because the mean of its divisors is an integer number (9687330).

Almost surely, 2^68887640 is an apocalyptic number.

It is an amenable number.

68887640 is an abundant number, since it is smaller than the sum of its proper divisors (86109640).

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

68887640 is a wasteful number, since it uses less digits than its factorization.

68887640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722202 (or 1722198 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 47.

The square root of 68887640 is about 8299.8578301077. The cubic root of 68887640 is about 409.9338382235.

The spelling of 68887640 in words is "sixty-eight million, eight hundred eighty-seven thousand, six hundred forty".