68943840 has 288 divisors, whose sum is σ = 267369984. Its totient is φ = 14622720.

The previous prime is 68943829. The next prime is 68943841. The reversal of 68943840 is 4834986.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 68943792 and 68943801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68943841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 971005 + ... + 971075.

It is an arithmetic number, because the mean of its divisors is an integer number (928368).

Almost surely, 2^68943840 is an apocalyptic number.

68943840 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 68943840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133684992).

68943840 is an abundant number, since it is smaller than the sum of its proper divisors (198426144).

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

68943840 is a wasteful number, since it uses less digits than its factorization.

68943840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 68943840 is about 8303.2427400384. The cubic root of 68943840 is about 410.0452854996.

The spelling of 68943840 in words is "sixty-eight million, nine hundred forty-three thousand, eight hundred forty".