64671997 has 8 divisors (see below), whose sum is σ = 69713280. Its totient is φ = 59640240.

The previous prime is 64671979. The next prime is 64672019. The reversal of 64671997 is 79917646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64671997 - 2¹¹ = 64669949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64671997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64671197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18672 + ... + 21862.

It is an arithmetic number, because the mean of its divisors is an integer number (8714160).

Almost surely, 2^64671997 is an apocalyptic number.

It is an amenable number.

64671997 is a deficient number, since it is larger than the sum of its proper divisors (5041283).

64671997 is a wasteful number, since it uses less digits than its factorization.

64671997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4763.

The product of its digits is 571536, while the sum is 49.

The square root of 64671997 is about 8041.8901385184. The cubic root of 64671997 is about 401.3951221781.

It can be divided in two parts, 6467 and 1997, that added together give a square (8464 = 92²).

The spelling of 64671997 in words is "sixty-four million, six hundred seventy-one thousand, nine hundred ninety-seven".