63994637 has 12 divisors (see below), whose sum is σ = 74630556. Its totient is φ = 54714240.

The previous prime is 63994631. The next prime is 63994639. The reversal of 63994637 is 73649936.

It can be written as a sum of positive squares in 2 ways, for example, as 22791076 + 41203561 = 4774^2 + 6419^2 .

It is not a de Polignac number, because 63994637 - 2⁶ = 63994573 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 63994591 and 63994600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63994631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21173 + ... + 24005.

It is an arithmetic number, because the mean of its divisors is an integer number (6219213).

Almost surely, 2^63994637 is an apocalyptic number.

It is an amenable number.

63994637 is a deficient number, since it is larger than the sum of its proper divisors (10635919).

63994637 is a wasteful number, since it uses less digits than its factorization.

63994637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3308 (or 3301 counting only the distinct ones).

The product of its digits is 734832, while the sum is 47.

The square root of 63994637 is about 7999.6648054778. The cubic root of 63994637 is about 399.9888267712.

The spelling of 63994637 in words is "sixty-three million, nine hundred ninety-four thousand, six hundred thirty-seven".