67664897 has 4 divisors (see below), whose sum is σ = 69493716. Its totient is φ = 65836080.

The previous prime is 67664881. The next prime is 67664939. The reversal of 67664897 is 79846676.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 39828721 + 27836176 = 6311^2 + 5276^2 .

It is a cyclic number.

It is not a de Polignac number, because 67664897 - 2⁴ = 67664881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67661897) 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, 914354 + ... + 914427.

It is an arithmetic number, because the mean of its divisors is an integer number (17373429).

Almost surely, 2^67664897 is an apocalyptic number.

It is an amenable number.

67664897 is a deficient number, since it is larger than the sum of its proper divisors (1828819).

67664897 is a wasteful number, since it uses less digits than its factorization.

67664897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828818.

The product of its digits is 3048192, while the sum is 53.

The square root of 67664897 is about 8225.8675530305. The cubic root of 67664897 is about 407.4939279209.

The spelling of 67664897 in words is "sixty-seven million, six hundred sixty-four thousand, eight hundred ninety-seven".