67998811 has 4 divisors (see below), whose sum is σ = 68194000. Its totient is φ = 67803624.

The previous prime is 67998803. The next prime is 67998817. The reversal of 67998811 is 11889976.

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 67998811 - 2³ = 67998803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67998817) 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, 97071 + ... + 97768.

It is an arithmetic number, because the mean of its divisors is an integer number (17048500).

Almost surely, 2^67998811 is an apocalyptic number.

67998811 is a deficient number, since it is larger than the sum of its proper divisors (195189).

67998811 is a wasteful number, since it uses less digits than its factorization.

67998811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195188.

The product of its digits is 217728, while the sum is 49.

The square root of 67998811 is about 8246.1391572056. The cubic root of 67998811 is about 408.1631312132.

The spelling of 67998811 in words is "sixty-seven million, nine hundred ninety-eight thousand, eight hundred eleven".