64475999 has 4 divisors (see below), whose sum is σ = 73686864. Its totient is φ = 55265136.

The previous prime is 64475989. The next prime is 64476011. The reversal of 64475999 is 99957446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64475999 - 2⁸ = 64475743 is a prime.

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 64475999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64475959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4605422 + ... + 4605435.

It is an arithmetic number, because the mean of its divisors is an integer number (18421716).

Almost surely, 2^64475999 is an apocalyptic number.

64475999 is a deficient number, since it is larger than the sum of its proper divisors (9210865).

64475999 is an equidigital number, since it uses as much as digits as its factorization.

64475999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9210864.

The product of its digits is 2449440, while the sum is 53.

The square root of 64475999 is about 8029.6948260815. The cubic root of 64475999 is about 400.9892161950.

The spelling of 64475999 in words is "sixty-four million, four hundred seventy-five thousand, nine hundred ninety-nine".