68737840 has 20 divisors (see below), whose sum is σ = 159815664. Its totient is φ = 27495104.

The previous prime is 68737813. The next prime is 68737847. The reversal of 68737840 is 4873786.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (68737847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 429532 + ... + 429691.

Almost surely, 2^68737840 is an apocalyptic number.

It is an amenable number.

68737840 is an abundant number, since it is smaller than the sum of its proper divisors (91077824).

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

68737840 is a wasteful number, since it uses less digits than its factorization.

68737840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859236 (or 859230 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 43.

The square root of 68737840 is about 8290.8286678715. The cubic root of 68737840 is about 409.6364812783.

The spelling of 68737840 in words is "sixty-eight million, seven hundred thirty-seven thousand, eight hundred forty".