63521164 has 24 divisors (see below), whose sum is σ = 127320480. Its totient is φ = 27163776.

The previous prime is 63521137. The next prime is 63521179. The reversal of 63521164 is 46112536.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12024 + ... + 16480.

It is an arithmetic number, because the mean of its divisors is an integer number (5305020).

Almost surely, 2^63521164 is an apocalyptic number.

It is an amenable number.

63521164 is an abundant number, since it is smaller than the sum of its proper divisors (63799316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63521164 is a wasteful number, since it uses less digits than its factorization.

63521164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4977 (or 4975 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 63521164 is about 7970.0165620907. The cubic root of 63521164 is about 398.9999267174. Note that the first 4 decimals are identical.

The spelling of 63521164 in words is "sixty-three million, five hundred twenty-one thousand, one hundred sixty-four".