115557778 has 24 divisors (see below), whose sum is σ = 203917500. Its totient is φ = 48964608.

The previous prime is 115557769. The next prime is 115557787. The reversal of 115557778 is 877755511.

It is an interprime number because it is at equal distance from previous prime (115557769) and next prime (115557787).

It can be written as a sum of positive squares in 2 ways, for example, as 106028209 + 9529569 = 10297^2 + 3087^2 .

It is a plaindrome in base 10.

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 11 ways as a sum of consecutive naturals, for example, 2098 + ... + 15346.

Almost surely, 2^115557778 is an apocalyptic number.

115557778 is a deficient number, since it is larger than the sum of its proper divisors (88359722).

115557778 is a wasteful number, since it uses less digits than its factorization.

115557778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13354 (or 13347 counting only the distinct ones).

The product of its digits is 343000, while the sum is 46.

The square root of 115557778 is about 10749.7803698494. The cubic root of 115557778 is about 487.0793608466.

The spelling of 115557778 in words is "one hundred fifteen million, five hundred fifty-seven thousand, seven hundred seventy-eight".