64928609 has 8 divisors (see below), whose sum is σ = 68681472. Its totient is φ = 61253280.

The previous prime is 64928603. The next prime is 64928653. The reversal of 64928609 is 90682946.

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-64928609 is a prime.

It is a super-3 number, since 3×64928609³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64928609.

It is not an unprimeable number, because it can be changed into a prime (64928603) 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, 17657 + ... + 21014.

It is an arithmetic number, because the mean of its divisors is an integer number (8585184).

Almost surely, 2^64928609 is an apocalyptic number.

It is an amenable number.

64928609 is a deficient number, since it is larger than the sum of its proper divisors (3752863).

64928609 is a wasteful number, since it uses less digits than its factorization.

64928609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38767.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 64928609 is about 8057.8290500606. The cubic root of 64928609 is about 401.9253200714.

The spelling of 64928609 in words is "sixty-four million, nine hundred twenty-eight thousand, six hundred nine".