63967638 has 24 divisors (see below), whose sum is σ = 148823352. Its totient is φ = 18276384.

The previous prime is 63967621. The next prime is 63967639. The reversal of 63967638 is 83676936.

It is a happy number.

It is a super-2 number, since 2×63967638² = 8183717422598088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63967639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108495 + ... + 109082.

It is an arithmetic number, because the mean of its divisors is an integer number (6200973).

Almost surely, 2^63967638 is an apocalyptic number.

63967638 is an abundant number, since it is smaller than the sum of its proper divisors (84855714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63967638 is a wasteful number, since it uses less digits than its factorization.

63967638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217596 (or 217589 counting only the distinct ones).

The product of its digits is 979776, while the sum is 48.

The square root of 63967638 is about 7997.9771192471. The cubic root of 63967638 is about 399.9325677996.

The spelling of 63967638 in words is "sixty-three million, nine hundred sixty-seven thousand, six hundred thirty-eight".