63897987 has 4 divisors (see below), whose sum is σ = 85197320. Its totient is φ = 42598656.

The previous prime is 63897959. The next prime is 63897989. The reversal of 63897987 is 78979836.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 63897987 - 2⁸ = 63897731 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (63897989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10649662 + ... + 10649667.

It is an arithmetic number, because the mean of its divisors is an integer number (21299330).

Almost surely, 2^63897987 is an apocalyptic number.

63897987 is a deficient number, since it is larger than the sum of its proper divisors (21299333).

63897987 is a wasteful number, since it uses less digits than its factorization.

63897987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21299332.

The product of its digits is 4572288, while the sum is 57.

The square root of 63897987 is about 7993.6216447865. The cubic root of 63897987 is about 399.7873598972.

The spelling of 63897987 in words is "sixty-three million, eight hundred ninety-seven thousand, nine hundred eighty-seven".