63721416 has 64 divisors (see below), whose sum is σ = 176774400. Its totient is φ = 18977600.

The previous prime is 63721409. The next prime is 63721417. The reversal of 63721416 is 61412736.

It is not an unprimeable number, because it can be changed into a prime (63721417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13531 + ... + 17621.

It is an arithmetic number, because the mean of its divisors is an integer number (2762100).

Almost surely, 2^63721416 is an apocalyptic number.

63721416 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63721416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88387200).

63721416 is an abundant number, since it is smaller than the sum of its proper divisors (113052984).

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

63721416 is a wasteful number, since it uses less digits than its factorization.

63721416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4170 (or 4166 counting only the distinct ones).

The product of its digits is 6048, while the sum is 30.

The square root of 63721416 is about 7982.5695111286. The cubic root of 63721416 is about 399.4187725123.

The spelling of 63721416 in words is "sixty-three million, seven hundred twenty-one thousand, four hundred sixteen".