158499978 has 96 divisors (see below), whose sum is σ = 401982336. Its totient is φ = 40569984.

The previous prime is 158499967. The next prime is 158499983. The reversal of 158499978 is 879994851.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1009476 + ... + 1009632.

It is an arithmetic number, because the mean of its divisors is an integer number (4187316).

Almost surely, 2^158499978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 158499978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200991168).

158499978 is an abundant number, since it is smaller than the sum of its proper divisors (243482358).

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

158499978 is a wasteful number, since it uses less digits than its factorization.

158499978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 225 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 60.

The square root of 158499978 is about 12589.6774382825. The cubic root of 158499978 is about 541.1816578865.

The spelling of 158499978 in words is "one hundred fifty-eight million, four hundred ninety-nine thousand, nine hundred seventy-eight".