63945738 has 48 divisors (see below), whose sum is σ = 148936320. Its totient is φ = 19755648.

The previous prime is 63945733. The next prime is 63945757. The reversal of 63945738 is 83754936.

63945738 is a `hidden beast` number, since 639 + 4 + 5 + 7 + 3 + 8 = 666.

It is a super-3 number, since 3×63945738³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 63945693 and 63945702.

It is not an unprimeable number, because it can be changed into a prime (63945733) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18943 + ... + 22061.

It is an arithmetic number, because the mean of its divisors is an integer number (3102840).

It is a vampire number, since it can be written as 6834 ⋅ 9357 (with its own digits).

Almost surely, 2^63945738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63945738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74468160).

63945738 is an abundant number, since it is smaller than the sum of its proper divisors (84990582).

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

63945738 is a wasteful number, since it uses less digits than its factorization.

63945738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3211 (or 3208 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 63945738 is about 7996.6079058561. The cubic root of 63945738 is about 399.8869222032.

The spelling of 63945738 in words is "sixty-three million, nine hundred forty-five thousand, seven hundred thirty-eight".