68640441 has 32 divisors (see below), whose sum is σ = 102021120. Its totient is φ = 40829184.

The previous prime is 68640421. The next prime is 68640443. The reversal of 68640441 is 14404686.

It is not a de Polignac number, because 68640441 - 2⁵ = 68640409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68640443) 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, 191020 + ... + 191378.

It is an arithmetic number, because the mean of its divisors is an integer number (3188160).

Almost surely, 2^68640441 is an apocalyptic number.

It is an amenable number.

68640441 is a deficient number, since it is larger than the sum of its proper divisors (33380679).

68640441 is a wasteful number, since it uses less digits than its factorization.

68640441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565.

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 68640441 is about 8284.9526854412. The cubic root of 68640441 is about 409.4429098614.

The spelling of 68640441 in words is "sixty-eight million, six hundred forty thousand, four hundred forty-one".