639061038 has 144 divisors (see below), whose sum is σ = 1771286400. Its totient is φ = 164656800.

The previous prime is 639061019. The next prime is 639061039. The reversal of 639061038 is 830160936.

It is a happy number.

639061038 is a `hidden beast` number, since 6 + 3 + 9 + 0 + 610 + 38 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 639060993 and 639061011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639061039) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1930533 + ... + 1930863.

It is an arithmetic number, because the mean of its divisors is an integer number (12300600).

Almost surely, 2^639061038 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639061038, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (885643200).

639061038 is an abundant number, since it is smaller than the sum of its proper divisors (1132225362).

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

639061038 is a wasteful number, since it uses less digits than its factorization.

639061038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563 (or 553 counting only the distinct ones).

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

The square root of 639061038 is about 25279.6566036804. The cubic root of 639061038 is about 861.3522255101.

The spelling of 639061038 in words is "six hundred thirty-nine million, sixty-one thousand, thirty-eight".