68991803 has 4 divisors (see below), whose sum is σ = 69216840. Its totient is φ = 68766768.

The previous prime is 68991799. The next prime is 68991847. The reversal of 68991803 is 30819986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30819986 = 2 ⋅15409993.

It is a cyclic number.

It is not a de Polignac number, because 68991803 - 2² = 68991799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68991863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112058 + ... + 112671.

It is an arithmetic number, because the mean of its divisors is an integer number (17304210).

Almost surely, 2^68991803 is an apocalyptic number.

68991803 is a deficient number, since it is larger than the sum of its proper divisors (225037).

68991803 is a wasteful number, since it uses less digits than its factorization.

68991803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225036.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 68991803 is about 8306.1304468447. The cubic root of 68991803 is about 410.1403505222.

The spelling of 68991803 in words is "sixty-eight million, nine hundred ninety-one thousand, eight hundred three".