64644397 has 8 divisors (see below), whose sum is σ = 65359872. Its totient is φ = 63932400.

The previous prime is 64644373. The next prime is 64644401. The reversal of 64644397 is 79344646.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64644397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64644997) 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, 54147 + ... + 55327.

It is an arithmetic number, because the mean of its divisors is an integer number (8169984).

Almost surely, 2^64644397 is an apocalyptic number.

It is an amenable number.

64644397 is a deficient number, since it is larger than the sum of its proper divisors (715475).

64644397 is a wasteful number, since it uses less digits than its factorization.

64644397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739.

The product of its digits is 435456, while the sum is 43.

The square root of 64644397 is about 8040.1739409045. The cubic root of 64644397 is about 401.3380130622.

The spelling of 64644397 in words is "sixty-four million, six hundred forty-four thousand, three hundred ninety-seven".