63642331 has 4 divisors (see below), whose sum is σ = 65362432. Its totient is φ = 61922232.

The previous prime is 63642323. The next prime is 63642377. The reversal of 63642331 is 13324636.

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

It is a cyclic number.

It is not a de Polignac number, because 63642331 - 2³ = 63642323 is a prime.

It is a super-2 number, since 2×63642331² = 8100692590227122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63642331.

It is not an unprimeable number, because it can be changed into a prime (63642431) 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, 859995 + ... + 860068.

It is an arithmetic number, because the mean of its divisors is an integer number (16340608).

Almost surely, 2^63642331 is an apocalyptic number.

63642331 is a deficient number, since it is larger than the sum of its proper divisors (1720101).

63642331 is a wasteful number, since it uses less digits than its factorization.

63642331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720100.

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

The square root of 63642331 is about 7977.6143677167. The cubic root of 63642331 is about 399.2534638261.

Adding to 63642331 its reverse (13324636), we get a palindrome (76966967).

The spelling of 63642331 in words is "sixty-three million, six hundred forty-two thousand, three hundred thirty-one".