64671868 has 24 divisors (see below), whose sum is σ = 115327520. Its totient is φ = 31726080.

The previous prime is 64671863. The next prime is 64671881. The reversal of 64671868 is 86817646.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64671863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69913 + ... + 70831.

Almost surely, 2^64671868 is an apocalyptic number.

It is an amenable number.

64671868 is a deficient number, since it is larger than the sum of its proper divisors (50655652).

64671868 is a wasteful number, since it uses less digits than its factorization.

64671868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237 (or 1235 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The square root of 64671868 is about 8041.8821180119. The cubic root of 64671868 is about 401.3948552929.

The spelling of 64671868 in words is "sixty-four million, six hundred seventy-one thousand, eight hundred sixty-eight".