64756646 has 4 divisors (see below), whose sum is σ = 97134972. Its totient is φ = 32378322.

The previous prime is 64756633. The next prime is 64756663. The reversal of 64756646 is 64665746.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64665746 = 2 ⋅32332873.

It is a junction number, because it is equal to n+sod(n) for n = 64756597 and 64756606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16189160 + ... + 16189163.

It is an arithmetic number, because the mean of its divisors is an integer number (24283743).

Almost surely, 2^64756646 is an apocalyptic number.

64756646 is a deficient number, since it is larger than the sum of its proper divisors (32378326).

64756646 is a wasteful number, since it uses less digits than its factorization.

64756646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32378325.

The product of its digits is 725760, while the sum is 44.

The square root of 64756646 is about 8047.1514214659. The cubic root of 64756646 is about 401.5701741512.

The spelling of 64756646 in words is "sixty-four million, seven hundred fifty-six thousand, six hundred forty-six".