1158162978 has 32 divisors (see below), whose sum is σ = 2802950784. Its totient is φ = 311438592.

The previous prime is 1158162977. The next prime is 1158162991. The reversal of 1158162978 is 8792618511.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1158162977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 810325 + ... + 811752.

It is an arithmetic number, because the mean of its divisors is an integer number (87592212).

Almost surely, 2^1158162978 is an apocalyptic number.

1158162978 is an abundant number, since it is smaller than the sum of its proper divisors (1644787806).

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

1158162978 is a wasteful number, since it uses less digits than its factorization.

1158162978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622106.

The product of its digits is 241920, while the sum is 48.

The square root of 1158162978 is about 34031.7936347763. The cubic root of 1158162978 is about 1050.1626287783.

The spelling of 1158162978 in words is "one billion, one hundred fifty-eight million, one hundred sixty-two thousand, nine hundred seventy-eight".