68333991 has 16 divisors (see below), whose sum is σ = 99540480. Its totient is φ = 41353920.

The previous prime is 68333971. The next prime is 68334017. The reversal of 68333991 is 19933386.

It is not a de Polignac number, because 68333991 - 2⁶ = 68333927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68333971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33291 + ... + 35283.

It is an arithmetic number, because the mean of its divisors is an integer number (6221280).

Almost surely, 2^68333991 is an apocalyptic number.

68333991 is a deficient number, since it is larger than the sum of its proper divisors (31206489).

68333991 is a wasteful number, since it uses less digits than its factorization.

68333991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3046.

The product of its digits is 104976, while the sum is 42.

The square root of 68333991 is about 8266.4376245152. The cubic root of 68333991 is about 408.8326720715.

The spelling of 68333991 in words is "sixty-eight million, three hundred thirty-three thousand, nine hundred ninety-one".