158731328 has 56 divisors (see below), whose sum is σ = 362712000. Its totient is φ = 67511808.

The previous prime is 158731289. The next prime is 158731357. The reversal of 158731328 is 823137851.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a junction number, because it is equal to n+sod(n) for n = 158731291 and 158731300.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60998 + ... + 63546.

It is an arithmetic number, because the mean of its divisors is an integer number (6477000).

Almost surely, 2^158731328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 158731328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181356000).

158731328 is an abundant number, since it is smaller than the sum of its proper divisors (203980672).

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

158731328 is a wasteful number, since it uses less digits than its factorization.

158731328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2707 (or 2697 counting only the distinct ones).

The product of its digits is 40320, while the sum is 38.

The square root of 158731328 is about 12598.8621708470. The cubic root of 158731328 is about 541.4448367030. Note that the first 3 decimals are identical.

The spelling of 158731328 in words is "one hundred fifty-eight million, seven hundred thirty-one thousand, three hundred twenty-eight".