63990387 has 12 divisors (see below), whose sum is σ = 93295800. Its totient is φ = 42260928.

The previous prime is 63990379. The next prime is 63990391. The reversal of 63990387 is 78309936.

It is a happy number.

63990387 is a `hidden beast` number, since 639 + 9 + 0 + 3 + 8 + 7 = 666.

It is not a de Polignac number, because 63990387 - 2³ = 63990379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63990307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32262 + ... + 34187.

It is an arithmetic number, because the mean of its divisors is an integer number (7774650).

Almost surely, 2^63990387 is an apocalyptic number.

63990387 is a deficient number, since it is larger than the sum of its proper divisors (29305413).

63990387 is a wasteful number, since it uses less digits than its factorization.

63990387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66562 (or 66559 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 63990387 is about 7999.3991649373. The cubic root of 63990387 is about 399.9799719139.

The spelling of 63990387 in words is "sixty-three million, nine hundred ninety thousand, three hundred eighty-seven".