91878954078 has 8 divisors (see below), whose sum is σ = 183757908168. Its totient is φ = 30626318024.

The previous prime is 91878954077. The next prime is 91878954107. The reversal of 91878954078 is 87045987819.

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

91878954078 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91878954073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7656579501 + ... + 7656579512.

It is an arithmetic number, because the mean of its divisors is an integer number (22969738521).

Almost surely, 2^91878954078 is an apocalyptic number.

91878954078 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

91878954078 is a wasteful number, since it uses less digits than its factorization.

91878954078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15313159018.

The product of its (nonzero) digits is 40642560, while the sum is 66.

The spelling of 91878954078 in words is "ninety-one billion, eight hundred seventy-eight million, nine hundred fifty-four thousand, seventy-eight".