158827781 has 16 divisors (see below), whose sum is σ = 184843008. Its totient is φ = 133660800.

The previous prime is 158827777. The next prime is 158827789. The reversal of 158827781 is 187728851.

It is not a de Polignac number, because 158827781 - 2² = 158827777 is a prime.

It is a super-2 number, since 2×158827781² = 50452528034767922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158827789) 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, 155051 + ... + 156071.

It is an arithmetic number, because the mean of its divisors is an integer number (11552688).

Almost surely, 2^158827781 is an apocalyptic number.

It is an amenable number.

158827781 is a deficient number, since it is larger than the sum of its proper divisors (26015227).

158827781 is a wasteful number, since it uses less digits than its factorization.

158827781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412.

The product of its digits is 250880, while the sum is 47.

The square root of 158827781 is about 12602.6894351960. The cubic root of 158827781 is about 541.5544840447.

The spelling of 158827781 in words is "one hundred fifty-eight million, eight hundred twenty-seven thousand, seven hundred eighty-one".