64156409 has 8 divisors (see below), whose sum is σ = 65995968. Its totient is φ = 62322480.

The previous prime is 64156357. The next prime is 64156441. The reversal of 64156409 is 90465146.

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 64156409 - 2⁸ = 64156153 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64156459) 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, 34124 + ... + 35954.

It is an arithmetic number, because the mean of its divisors is an integer number (8249496).

Almost surely, 2^64156409 is an apocalyptic number.

It is an amenable number.

64156409 is a deficient number, since it is larger than the sum of its proper divisors (1839559).

64156409 is a wasteful number, since it uses less digits than its factorization.

64156409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2815.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 64156409 is about 8009.7695971857. The cubic root of 64156409 is about 400.3255869942.

The spelling of 64156409 in words is "sixty-four million, one hundred fifty-six thousand, four hundred nine".