64356646 has 4 divisors (see below), whose sum is σ = 96534972. Its totient is φ = 32178322.

The previous prime is 64356637. The next prime is 64356671. The reversal of 64356646 is 64665346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64665346 = 2 ⋅32332673.

It is a junction number, because it is equal to n+sod(n) for n = 64356599 and 64356608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16089160 + ... + 16089163.

It is an arithmetic number, because the mean of its divisors is an integer number (24133743).

Almost surely, 2^64356646 is an apocalyptic number.

64356646 is a deficient number, since it is larger than the sum of its proper divisors (32178326).

64356646 is a wasteful number, since it uses less digits than its factorization.

64356646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32178325.

The product of its digits is 311040, while the sum is 40.

The square root of 64356646 is about 8022.2594074238. The cubic root of 64356646 is about 400.7416365881.

The spelling of 64356646 in words is "sixty-four million, three hundred fifty-six thousand, six hundred forty-six".