158638820 has 48 divisors (see below), whose sum is σ = 349574400. Its totient is φ = 60356736.

The previous prime is 158638819. The next prime is 158638829. The reversal of 158638820 is 28836851.

It is not an unprimeable number, because it can be changed into a prime (158638829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90674 + ... + 92406.

It is an arithmetic number, because the mean of its divisors is an integer number (7282800).

Almost surely, 2^158638820 is an apocalyptic number.

158638820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 158638820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174787200).

158638820 is an abundant number, since it is smaller than the sum of its proper divisors (190935580).

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

158638820 is a wasteful number, since it uses less digits than its factorization.

158638820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1964 (or 1962 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 41.

The square root of 158638820 is about 12595.1903518764. The cubic root of 158638820 is about 541.3396322818.

The spelling of 158638820 in words is "one hundred fifty-eight million, six hundred thirty-eight thousand, eight hundred twenty".