68688432 has 160 divisors (see below), whose sum is σ = 214272000. Its totient is φ = 20984832.

The previous prime is 68688377. The next prime is 68688437. The reversal of 68688432 is 23488686.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (68688437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 345069 + ... + 345267.

It is an arithmetic number, because the mean of its divisors is an integer number (1339200).

Almost surely, 2^68688432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68688432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107136000).

68688432 is an abundant number, since it is smaller than the sum of its proper divisors (145583568).

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

68688432 is a wasteful number, since it uses less digits than its factorization.

68688432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 268 counting only the distinct ones).

The product of its digits is 442368, while the sum is 45.

The square root of 68688432 is about 8287.8484542130. The cubic root of 68688432 is about 409.5383103607.

The spelling of 68688432 in words is "sixty-eight million, six hundred eighty-eight thousand, four hundred thirty-two".