64521646 has 8 divisors (see below), whose sum is σ = 110608560. Its totient is φ = 27652128.

The previous prime is 64521641. The next prime is 64521671. The reversal of 64521646 is 64612546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64521641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2304331 + ... + 2304358.

It is an arithmetic number, because the mean of its divisors is an integer number (13826070).

Almost surely, 2^64521646 is an apocalyptic number.

64521646 is a deficient number, since it is larger than the sum of its proper divisors (46086914).

64521646 is a wasteful number, since it uses less digits than its factorization.

64521646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4608698.

The product of its digits is 34560, while the sum is 34.

The square root of 64521646 is about 8032.5367101558. The cubic root of 64521646 is about 401.0838231660.

The spelling of 64521646 in words is "sixty-four million, five hundred twenty-one thousand, six hundred forty-six".