91878958 has 8 divisors (see below), whose sum is σ = 137863440. Its totient is φ = 45924480.

The previous prime is 91878953. The next prime is 91878971. The reversal of 91878958 is 85987819.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×91878958³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91878899 and 91878908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91878953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3223 + ... + 13933.

It is an arithmetic number, because the mean of its divisors is an integer number (17232930).

Almost surely, 2^91878958 is an apocalyptic number.

91878958 is a deficient number, since it is larger than the sum of its proper divisors (45984482).

91878958 is a wasteful number, since it uses less digits than its factorization.

91878958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15002.

The product of its digits is 1451520, while the sum is 55.

The square root of 91878958 is about 9585.3512194390. The cubic root of 91878958 is about 451.2376759141.

It can be divided in two parts, 9187 and 8958, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 91878958 in words is "ninety-one million, eight hundred seventy-eight thousand, nine hundred fifty-eight".