63987819 has 16 divisors (see below), whose sum is σ = 98419968. Its totient is φ = 36221472.

The previous prime is 63987811. The next prime is 63987851. The reversal of 63987819 is 91878936.

It is not a de Polignac number, because 63987819 - 2³ = 63987811 is a prime.

It is a super-2 number, since 2×63987819² = 8188881960753522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63987811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11992 + ... + 16485.

It is an arithmetic number, because the mean of its divisors is an integer number (6151248).

Almost surely, 2^63987819 is an apocalyptic number.

63987819 is a deficient number, since it is larger than the sum of its proper divisors (34432149).

63987819 is a wasteful number, since it uses less digits than its factorization.

63987819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28594.

The product of its digits is 653184, while the sum is 51.

The square root of 63987819 is about 7999.2386512718. The cubic root of 63987819 is about 399.9746213065.

The spelling of 63987819 in words is "sixty-three million, nine hundred eighty-seven thousand, eight hundred nineteen".