68817720 has 32 divisors (see below), whose sum is σ = 206453520. Its totient is φ = 18351360.

The previous prime is 68817713. The next prime is 68817731. The reversal of 68817720 is 2771886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 286621 + ... + 286860.

Almost surely, 2^68817720 is an apocalyptic number.

68817720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68817720 is an abundant number, since it is smaller than the sum of its proper divisors (137635800).

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

68817720 is a wasteful number, since it uses less digits than its factorization.

68817720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573495 (or 573491 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 68817720 is about 8295.6446404122. The cubic root of 68817720 is about 409.7950988850.

The spelling of 68817720 in words is "sixty-eight million, eight hundred seventeen thousand, seven hundred twenty".