115891778 has 4 divisors (see below), whose sum is σ = 173837670. Its totient is φ = 57945888.

The previous prime is 115891759. The next prime is 115891793. The reversal of 115891778 is 877198511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877198511 = 7 ⋅125314073.

It can be written as a sum of positive squares in only one way, i.e., 94148209 + 21743569 = 9703^2 + 4663^2 .

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 as a sum of consecutive naturals, namely, 28972943 + ... + 28972946.

Almost surely, 2^115891778 is an apocalyptic number.

115891778 is a deficient number, since it is larger than the sum of its proper divisors (57945892).

115891778 is an equidigital number, since it uses as much as digits as its factorization.

115891778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57945891.

The product of its digits is 141120, while the sum is 47.

The square root of 115891778 is about 10765.3043616983. The cubic root of 115891778 is about 487.5481826582.

The spelling of 115891778 in words is "one hundred fifteen million, eight hundred ninety-one thousand, seven hundred seventy-eight".