68899999 has 4 divisors (see below), whose sum is σ = 78742864. Its totient is φ = 59057136.

The previous prime is 68899993. The next prime is 68900009. The reversal of 68899999 is 99999886.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68899999 - 2³ = 68899991 is a prime.

It is a Duffinian number.

68899999 is a modest number, since divided by 9999 gives 6889 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68899991) 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, 4921422 + ... + 4921435.

It is an arithmetic number, because the mean of its divisors is an integer number (19685716).

Almost surely, 2^68899999 is an apocalyptic number.

68899999 is a deficient number, since it is larger than the sum of its proper divisors (9842865).

68899999 is an equidigital number, since it uses as much as digits as its factorization.

68899999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9842864.

The product of its digits is 22674816, while the sum is 67.

The square root of 68899999 is about 8300.6023275423. The cubic root of 68899999 is about 409.9583519067.

The spelling of 68899999 in words is "sixty-eight million, eight hundred ninety-nine thousand, nine hundred ninety-nine".