64673215 has 4 divisors (see below), whose sum is σ = 77607864. Its totient is φ = 51738568.

The previous prime is 64673137. The next prime is 64673221. The reversal of 64673215 is 51237646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51237646 = 2 ⋅25618823.

It is a cyclic number.

It is not a de Polignac number, because 64673215 - 2⁷ = 64673087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 6467317 + ... + 6467326.

It is an arithmetic number, because the mean of its divisors is an integer number (19401966).

Almost surely, 2^64673215 is an apocalyptic number.

64673215 is a deficient number, since it is larger than the sum of its proper divisors (12934649).

64673215 is a wasteful number, since it uses less digits than its factorization.

64673215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12934648.

The product of its digits is 30240, while the sum is 34.

The square root of 64673215 is about 8041.9658666274. The cubic root of 64673215 is about 401.3976420539.

The spelling of 64673215 in words is "sixty-four million, six hundred seventy-three thousand, two hundred fifteen".