67998057 has 4 divisors (see below), whose sum is σ = 90664080. Its totient is φ = 45332036.

The previous prime is 67998053. The next prime is 67998059. The reversal of 67998057 is 75089976.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67998057 - 2² = 67998053 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67998053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11333007 + ... + 11333012.

It is an arithmetic number, because the mean of its divisors is an integer number (22666020).

Almost surely, 2^67998057 is an apocalyptic number.

It is an amenable number.

67998057 is a deficient number, since it is larger than the sum of its proper divisors (22666023).

67998057 is a wasteful number, since it uses less digits than its factorization.

67998057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22666022.

The product of its (nonzero) digits is 952560, while the sum is 51.

The square root of 67998057 is about 8246.0934387139. The cubic root of 67998057 is about 408.1616225783.

The spelling of 67998057 in words is "sixty-seven million, nine hundred ninety-eight thousand, fifty-seven".