63625644 has 54 divisors (see below), whose sum is σ = 165423804. Its totient is φ = 20619360.

The previous prime is 63625643. The next prime is 63625693. The reversal of 63625644 is 44652636.

63625644 is a `hidden beast` number, since 6 + 3 + 6 + 2 + 5 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 63625599 and 63625608.

It is not an unprimeable number, because it can be changed into a prime (63625643) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 48639 + ... + 49929.

Almost surely, 2^63625644 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 63625644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82711902).

63625644 is an abundant number, since it is smaller than the sum of its proper divisors (101798160).

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

63625644 is a wasteful number, since it uses less digits than its factorization.

63625644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375 (or 1333 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 63625644 is about 7976.5684351104. The cubic root of 63625644 is about 399.2185660633.

The spelling of 63625644 in words is "sixty-three million, six hundred twenty-five thousand, six hundred forty-four".