63990538 has 8 divisors (see below), whose sum is σ = 98580132. Its totient is φ = 31130496.

The previous prime is 63990529. The next prime is 63990581. The reversal of 63990538 is 83509936.

It can be written as a sum of positive squares in 2 ways, for example, as 62773929 + 1216609 = 7923^2 + 1103^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 63990494 and 63990503.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 432295 + ... + 432442.

Almost surely, 2^63990538 is an apocalyptic number.

63990538 is a deficient number, since it is larger than the sum of its proper divisors (34589594).

63990538 is a wasteful number, since it uses less digits than its factorization.

63990538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864776.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 63990538 is about 7999.4086031406. The cubic root of 63990538 is about 399.9802865285.

The spelling of 63990538 in words is "sixty-three million, nine hundred ninety thousand, five hundred thirty-eight".