158878321 has 8 divisors (see below), whose sum is σ = 186004224. Its totient is φ = 132859680.

The previous prime is 158878309. The next prime is 158878331. The reversal of 158878321 is 123878851.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 158878321 - 2¹⁵ = 158845553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (158878301) 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 7 ways as a sum of consecutive naturals, for example, 276505 + ... + 277078.

It is an arithmetic number, because the mean of its divisors is an integer number (23250528).

Almost surely, 2^158878321 is an apocalyptic number.

It is an amenable number.

158878321 is a deficient number, since it is larger than the sum of its proper divisors (27125903).

158878321 is an equidigital number, since it uses as much as digits as its factorization.

158878321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553631.

The product of its digits is 107520, while the sum is 43.

The square root of 158878321 is about 12604.6944032769. The cubic root of 158878321 is about 541.6119199685.

The spelling of 158878321 in words is "one hundred fifty-eight million, eight hundred seventy-eight thousand, three hundred twenty-one".