91078 has 16 divisors (see below), whose sum is σ = 153216. Its totient is φ = 40320.

The previous prime is 91033. The next prime is 91079. The reversal of 91078 is 87019.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 750 + ... + 862.

It is an arithmetic number, because the mean of its divisors is an integer number (9576).

2⁹¹⁰⁷⁸ is an apocalyptic number.

91078 is a deficient number, since it is larger than the sum of its proper divisors (62138).

91078 is a wasteful number, since it uses less digits than its factorization.

91078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 91078 is about 301.7913186293. The cubic root of 91078 is about 44.9922620440.

The spelling of 91078 in words is "ninety-one thousand, seventy-eight".