68324640 has 96 divisors (see below), whose sum is σ = 217002240. Its totient is φ = 18069504.

The previous prime is 68324629. The next prime is 68324653. The reversal of 68324640 is 4642386.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×68324640² = 9336512862259200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65241 + ... + 66279.

It is an arithmetic number, because the mean of its divisors is an integer number (2260440).

Almost surely, 2^68324640 is an apocalyptic number.

68324640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68324640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108501120).

68324640 is an abundant number, since it is smaller than the sum of its proper divisors (148677600).

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

68324640 is a wasteful number, since it uses less digits than its factorization.

68324640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1194 (or 1186 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 68324640 is about 8265.8720048159. The cubic root of 68324640 is about 408.8140226475.

The spelling of 68324640 in words is "sixty-eight million, three hundred twenty-four thousand, six hundred forty".