158278478 has 4 divisors (see below), whose sum is σ = 237417720. Its totient is φ = 79139238.

The previous prime is 158278457. The next prime is 158278499. The reversal of 158278478 is 874872851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 874872851 = 349 ⋅2506799.

It is an interprime number because it is at equal distance from previous prime (158278457) and next prime (158278499).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39569618 + ... + 39569621.

It is an arithmetic number, because the mean of its divisors is an integer number (59354430).

Almost surely, 2^158278478 is an apocalyptic number.

158278478 is a deficient number, since it is larger than the sum of its proper divisors (79139242).

158278478 is an equidigital number, since it uses as much as digits as its factorization.

158278478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79139241.

The product of its digits is 1003520, while the sum is 50.

The square root of 158278478 is about 12580.8774733720. The cubic root of 158278478 is about 540.9294441398.

The spelling of 158278478 in words is "one hundred fifty-eight million, two hundred seventy-eight thousand, four hundred seventy-eight".