63489987 has 20 divisors (see below), whose sum is σ = 103466616. Its totient is φ = 38478240.

The previous prime is 63489949. The next prime is 63489989. The reversal of 63489987 is 78998436.

It is not a de Polignac number, because 63489987 - 2¹¹ = 63487939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63489989) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34738 + ... + 36519.

Almost surely, 2^63489987 is an apocalyptic number.

63489987 is a deficient number, since it is larger than the sum of its proper divisors (39976629).

63489987 is a wasteful number, since it uses less digits than its factorization.

63489987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71280 (or 71271 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 63489987 is about 7968.0604289877. The cubic root of 63489987 is about 398.9346379450.

The spelling of 63489987 in words is "sixty-three million, four hundred eighty-nine thousand, nine hundred eighty-seven".