64475919 has 12 divisors (see below), whose sum is σ = 96581576. Its totient is φ = 42983784.

The previous prime is 64475897. The next prime is 64475927. The reversal of 64475919 is 91957446.

It is a de Polignac number, because none of the positive numbers 2^k-64475919 is a prime.

It is a super-2 number, since 2×64475919² = 8314288261789122, which contains 22 as substring.

It is a Duffinian number.

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 (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 132424 + ... + 132909.

Almost surely, 2^64475919 is an apocalyptic number.

64475919 is a deficient number, since it is larger than the sum of its proper divisors (32105657).

64475919 is an equidigital number, since it uses as much as digits as its factorization.

64475919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265348 (or 265336 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 64475919 is about 8029.6898445706. The cubic root of 64475919 is about 400.9890503495.

The spelling of 64475919 in words is "sixty-four million, four hundred seventy-five thousand, nine hundred nineteen".