63690138 has 80 divisors (see below), whose sum is σ = 150264576. Its totient is φ = 20139840.

The previous prime is 63690127. The next prime is 63690191. The reversal of 63690138 is 83109636.

It is a happy number.

63690138 is a `hidden beast` number, since 636 + 9 + 0 + 13 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 285495 + ... + 285717.

Almost surely, 2^63690138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63690138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75132288).

63690138 is an abundant number, since it is smaller than the sum of its proper divisors (86574438).

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

63690138 is a wasteful number, since it uses less digits than its factorization.

63690138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 63690138 is about 7980.6101270517. The cubic root of 63690138 is about 399.3534095318.

The spelling of 63690138 in words is "sixty-three million, six hundred ninety thousand, one hundred thirty-eight".