63969920 has 128 divisors (see below), whose sum is σ = 177724800. Its totient is φ = 21565440.

The previous prime is 63969889. The next prime is 63969947. The reversal of 63969920 is 2996936.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488255 + ... + 488385.

It is an arithmetic number, because the mean of its divisors is an integer number (1388475).

Almost surely, 2^63969920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63969920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88862400).

63969920 is an abundant number, since it is smaller than the sum of its proper divisors (113754880).

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

63969920 is a wasteful number, since it uses less digits than its factorization.

63969920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 254 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 44.

The square root of 63969920 is about 7998.1197790481. The cubic root of 63969920 is about 399.9373235130.

The spelling of 63969920 in words is "sixty-three million, nine hundred sixty-nine thousand, nine hundred twenty".