63987901 has 4 divisors (see below), whose sum is σ = 64417500. Its totient is φ = 63558304.

The previous prime is 63987899. The next prime is 63987923. The reversal of 63987901 is 10978936.

63987901 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11062276 + 52925625 = 3326^2 + 7275^2 .

It is a cyclic number.

It is not a de Polignac number, because 63987901 - 2¹ = 63987899 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63987941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214576 + ... + 214873.

It is an arithmetic number, because the mean of its divisors is an integer number (16104375).

Almost surely, 2^63987901 is an apocalyptic number.

It is an amenable number.

63987901 is a deficient number, since it is larger than the sum of its proper divisors (429599).

63987901 is a wasteful number, since it uses less digits than its factorization.

63987901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429598.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 63987901 is about 7999.2437767579. The cubic root of 63987901 is about 399.9747921614.

The spelling of 63987901 in words is "sixty-three million, nine hundred eighty-seven thousand, nine hundred one".