63993897 has 12 divisors (see below), whose sum is σ = 100839024. Its totient is φ = 38784120.

The previous prime is 63993883. The next prime is 63993929. The reversal of 63993897 is 79839936.

It is not a de Polignac number, because 63993897 - 2¹² = 63989801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63993857) 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, 323103 + ... + 323300.

It is an arithmetic number, because the mean of its divisors is an integer number (8403252).

Almost surely, 2^63993897 is an apocalyptic number.

It is an amenable number.

63993897 is a deficient number, since it is larger than the sum of its proper divisors (36845127).

63993897 is a wasteful number, since it uses less digits than its factorization.

63993897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646420 (or 646417 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 54.

The square root of 63993897 is about 7999.6185534062. The cubic root of 63993897 is about 399.9872850125.

It can be divided in two parts, 6399 and 3897, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 63993897 in words is "sixty-three million, nine hundred ninety-three thousand, eight hundred ninety-seven".