63640243 has 4 divisors (see below), whose sum is σ = 63656928. Its totient is φ = 63623560.

The previous prime is 63640237. The next prime is 63640249. The reversal of 63640243 is 34204636.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (63640237) and next prime (63640249).

It is a cyclic number.

It is not a de Polignac number, because 63640243 - 2⁹ = 63639731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63640249) 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, 513 + ... + 11293.

It is an arithmetic number, because the mean of its divisors is an integer number (15914232).

Almost surely, 2^63640243 is an apocalyptic number.

63640243 is a deficient number, since it is larger than the sum of its proper divisors (16685).

63640243 is a wasteful number, since it uses less digits than its factorization.

63640243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16684.

The product of its (nonzero) digits is 10368, while the sum is 28.

The square root of 63640243 is about 7977.4835004530. The cubic root of 63640243 is about 399.2490974957.

Adding to 63640243 its reverse (34204636), we get a palindrome (97844879).

The spelling of 63640243 in words is "sixty-three million, six hundred forty thousand, two hundred forty-three".