67998899 has 4 divisors (see below), whose sum is σ = 68015760. Its totient is φ = 67982040.

The previous prime is 67998863. The next prime is 67998907. The reversal of 67998899 is 99889976.

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 67998899 - 2¹² = 67994803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67998299) 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, 1589 + ... + 11769.

It is an arithmetic number, because the mean of its divisors is an integer number (17003940).

Almost surely, 2^67998899 is an apocalyptic number.

67998899 is a deficient number, since it is larger than the sum of its proper divisors (16861).

67998899 is a wasteful number, since it uses less digits than its factorization.

67998899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16860.

The product of its digits is 17635968, while the sum is 65.

The square root of 67998899 is about 8246.1444930343. The cubic root of 67998899 is about 408.1633072866.

The spelling of 67998899 in words is "sixty-seven million, nine hundred ninety-eight thousand, eight hundred ninety-nine".