64633643 has 8 divisors (see below), whose sum is σ = 69400800. Its totient is φ = 59973760.

The previous prime is 64633607. The next prime is 64633693. The reversal of 64633643 is 34633646.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 64633643 - 2¹² = 64629547 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64633693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25568 + ... + 27981.

It is an arithmetic number, because the mean of its divisors is an integer number (8675100).

Almost surely, 2^64633643 is an apocalyptic number.

64633643 is a deficient number, since it is larger than the sum of its proper divisors (4767157).

64633643 is a wasteful number, since it uses less digits than its factorization.

64633643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53637.

The product of its digits is 93312, while the sum is 35.

The square root of 64633643 is about 8039.5051464627. The cubic root of 64633643 is about 401.3157567979.

The spelling of 64633643 in words is "sixty-four million, six hundred thirty-three thousand, six hundred forty-three".