63987716 has 24 divisors (see below), whose sum is σ = 123537624. Its totient is φ = 28811520.

The previous prime is 63987713. The next prime is 63987731. The reversal of 63987716 is 61778936.

It can be written as a sum of positive squares in 4 ways, for example, as 13293316 + 50694400 = 3646^2 + 7120^2 .

It is not an unprimeable number, because it can be changed into a prime (63987713) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12875 + ... + 17138.

It is an arithmetic number, because the mean of its divisors is an integer number (5147401).

Almost surely, 2^63987716 is an apocalyptic number.

It is an amenable number.

63987716 is a deficient number, since it is larger than the sum of its proper divisors (59549908).

63987716 is a wasteful number, since it uses less digits than its factorization.

63987716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30071 (or 30069 counting only the distinct ones).

The product of its digits is 381024, while the sum is 47.

The square root of 63987716 is about 7999.2322131565. The cubic root of 63987716 is about 399.9744066958.

The spelling of 63987716 in words is "sixty-three million, nine hundred eighty-seven thousand, seven hundred sixteen".