63990738 has 96 divisors (see below), whose sum is σ = 168210432. Its totient is φ = 17186400.

The previous prime is 63990721. The next prime is 63990757. The reversal of 63990738 is 83709936.

It is a happy number.

63990738 is a `hidden beast` number, since 639 + 9 + 0 + 7 + 3 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 63990693 and 63990702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 205603 + ... + 205913.

It is an arithmetic number, because the mean of its divisors is an integer number (1752192).

Almost surely, 2^63990738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63990738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84105216).

63990738 is an abundant number, since it is smaller than the sum of its proper divisors (104219694).

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

63990738 is a wasteful number, since it uses less digits than its factorization.

63990738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 63990738 is about 7999.4211040550. The cubic root of 63990738 is about 399.9807032358.

The spelling of 63990738 in words is "sixty-three million, nine hundred ninety thousand, seven hundred thirty-eight".