158557572 has 54 divisors (see below), whose sum is σ = 425210058. Its totient is φ = 49645824.

The previous prime is 158557549. The next prime is 158557601. The reversal of 158557572 is 275755851.

158557572 is a `hidden beast` number, since 1 + 5 + 8 + 5 + 575 + 72 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 94012416 + 64545156 = 9696^2 + 8034^2 .

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 311254 + ... + 311762.

Almost surely, 2^158557572 is an apocalyptic number.

158557572 is a gapful number since it is divisible by the number (12) 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 158557572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212605029).

158557572 is an abundant number, since it is smaller than the sum of its proper divisors (266652486).

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

158557572 is a wasteful number, since it uses less digits than its factorization.

158557572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045 (or 531 counting only the distinct ones).

The product of its digits is 490000, while the sum is 45.

The square root of 158557572 is about 12591.9645806363. The cubic root of 158557572 is about 541.2471995190.

The spelling of 158557572 in words is "one hundred fifty-eight million, five hundred fifty-seven thousand, five hundred seventy-two".