640132633 has 8 divisors (see below), whose sum is σ = 732049920. Its totient is φ = 548332800.

The previous prime is 640132583. The next prime is 640132657. The reversal of 640132633 is 336231046.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640132633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (640132033) 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, 17353 + ... + 39766.

It is an arithmetic number, because the mean of its divisors is an integer number (91506240).

Almost surely, 2^640132633 is an apocalyptic number.

It is an amenable number.

640132633 is a deficient number, since it is larger than the sum of its proper divisors (91917287).

640132633 is a wasteful number, since it uses less digits than its factorization.

640132633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58727.

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 640132633 is about 25300.8425353781. The cubic root of 640132633 is about 861.8334029709.

Adding to 640132633 its reverse (336231046), we get a palindrome (976363679).

The spelling of 640132633 in words is "six hundred forty million, one hundred thirty-two thousand, six hundred thirty-three".