68243840 has 64 divisors (see below), whose sum is σ = 186464160. Its totient is φ = 23396352.

The previous prime is 68243837. The next prime is 68243843. The reversal of 68243840 is 4834286.

It is an interprime number because it is at equal distance from previous prime (68243837) and next prime (68243843).

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 68243840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68243843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3137 + ... + 12096.

Almost surely, 2^68243840 is an apocalyptic number.

It is an amenable number.

68243840 is an abundant number, since it is smaller than the sum of its proper divisors (118220320).

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

68243840 is a wasteful number, since it uses less digits than its factorization.

68243840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15259 (or 15247 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 35.

The square root of 68243840 is about 8260.9829923563. The cubic root of 68243840 is about 408.6528060266.

The spelling of 68243840 in words is "sixty-eight million, two hundred forty-three thousand, eight hundred forty".