67643897 has 4 divisors (see below), whose sum is σ = 70584960. Its totient is φ = 64702836.

The previous prime is 67643893. The next prime is 67643899. The reversal of 67643897 is 79834676.

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 67643897 - 2² = 67643893 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67643893) 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, 1470497 + ... + 1470542.

It is an arithmetic number, because the mean of its divisors is an integer number (17646240).

Almost surely, 2^67643897 is an apocalyptic number.

It is an amenable number.

67643897 is a deficient number, since it is larger than the sum of its proper divisors (2941063).

67643897 is a wasteful number, since it uses less digits than its factorization.

67643897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941062.

The product of its digits is 1524096, while the sum is 50.

The square root of 67643897 is about 8224.5909928701. The cubic root of 67643897 is about 407.4517679123.

The spelling of 67643897 in words is "sixty-seven million, six hundred forty-three thousand, eight hundred ninety-seven".