64670809 has 4 divisors (see below), whose sum is σ = 73909504. Its totient is φ = 55432116.

The previous prime is 64670807. The next prime is 64670819. The reversal of 64670809 is 90807646.

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 a cyclic number.

It is not a de Polignac number, because 64670809 - 2¹ = 64670807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64670807) 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, 4619337 + ... + 4619350.

It is an arithmetic number, because the mean of its divisors is an integer number (18477376).

Almost surely, 2^64670809 is an apocalyptic number.

It is an amenable number.

64670809 is a deficient number, since it is larger than the sum of its proper divisors (9238695).

64670809 is an equidigital number, since it uses as much as digits as its factorization.

64670809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9238694.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 64670809 is about 8041.8162749468. The cubic root of 64670809 is about 401.3926643378.

The spelling of 64670809 in words is "sixty-four million, six hundred seventy thousand, eight hundred nine".