63990871 has 8 divisors (see below), whose sum is σ = 75109280. Its totient is φ = 53366688.

The previous prime is 63990833. The next prime is 63990929. The reversal of 63990871 is 17809936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63990871 - 2¹⁹ = 63466583 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 (63990821) 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, 123276 + ... + 123793.

It is an arithmetic number, because the mean of its divisors is an integer number (9388660).

Almost surely, 2^63990871 is an apocalyptic number.

63990871 is a deficient number, since it is larger than the sum of its proper divisors (11118409).

63990871 is a wasteful number, since it uses less digits than its factorization.

63990871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247113.

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

The square root of 63990871 is about 7999.4294171522. The cubic root of 63990871 is about 399.9809803456.

The spelling of 63990871 in words is "sixty-three million, nine hundred ninety thousand, eight hundred seventy-one".