63893991 has 48 divisors (see below), whose sum is σ = 103420800. Its totient is φ = 34961472.

The previous prime is 63893983. The next prime is 63893993. The reversal of 63893991 is 19939836.

It is a happy number.

It is not a de Polignac number, because 63893991 - 2³ = 63893983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63893991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63893993) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 459600 + ... + 459738.

It is an arithmetic number, because the mean of its divisors is an integer number (2154600).

Almost surely, 2^63893991 is an apocalyptic number.

63893991 is a deficient number, since it is larger than the sum of its proper divisors (39526809).

63893991 is a wasteful number, since it uses less digits than its factorization.

63893991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 261 counting only the distinct ones).

The product of its digits is 314928, while the sum is 48.

The square root of 63893991 is about 7993.3716915955. The cubic root of 63893991 is about 399.7790258652.

The spelling of 63893991 in words is "sixty-three million, eight hundred ninety-three thousand, nine hundred ninety-one".