64200009 has 4 divisors (see below), whose sum is σ = 85600016. Its totient is φ = 42800004.

The previous prime is 64200001. The next prime is 64200011. The reversal of 64200009 is 90000246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64200009 - 2³ = 64200001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64200001) 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, 10699999 + ... + 10700004.

It is an arithmetic number, because the mean of its divisors is an integer number (21400004).

Almost surely, 2^64200009 is an apocalyptic number.

It is an amenable number.

64200009 is a deficient number, since it is larger than the sum of its proper divisors (21400007).

64200009 is a wasteful number, since it uses less digits than its factorization.

64200009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21400006.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 64200009 is about 8012.4908112272. The cubic root of 64200009 is about 400.4162521019.

The spelling of 64200009 in words is "sixty-four million, two hundred thousand, nine".