64533646 has 4 divisors (see below), whose sum is σ = 96800472. Its totient is φ = 32266822.

The previous prime is 64533641. The next prime is 64533659. The reversal of 64533646 is 64633546.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64633546 = 2 ⋅32316773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64533641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16133410 + ... + 16133413.

It is an arithmetic number, because the mean of its divisors is an integer number (24200118).

Almost surely, 2^64533646 is an apocalyptic number.

64533646 is a deficient number, since it is larger than the sum of its proper divisors (32266826).

64533646 is a wasteful number, since it uses less digits than its factorization.

64533646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32266825.

The product of its digits is 155520, while the sum is 37.

The square root of 64533646 is about 8033.2836374673. The cubic root of 64533646 is about 401.1086866954.

The spelling of 64533646 in words is "sixty-four million, five hundred thirty-three thousand, six hundred forty-six".