1158878644 has 96 divisors (see below), whose sum is σ = 2793885696. Its totient is φ = 406433280.

The previous prime is 1158878629. The next prime is 1158878659. The reversal of 1158878644 is 4468788511.

It is an interprime number because it is at equal distance from previous prime (1158878629) and next prime (1158878659).

It is a junction number, because it is equal to n+sod(n) for n = 1158878591 and 1158878600.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 115617 + ... + 125239.

It is an arithmetic number, because the mean of its divisors is an integer number (29102976).

Almost surely, 2^1158878644 is an apocalyptic number.

1158878644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1158878644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1396942848).

1158878644 is an abundant number, since it is smaller than the sum of its proper divisors (1635007052).

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

1158878644 is a wasteful number, since it uses less digits than its factorization.

1158878644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9685 (or 9683 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 52.

The square root of 1158878644 is about 34042.3066786021. The cubic root of 1158878644 is about 1050.3788939470.

The spelling of 1158878644 in words is "one billion, one hundred fifty-eight million, eight hundred seventy-eight thousand, six hundred forty-four".