91887880 has 32 divisors (see below), whose sum is σ = 236283840. Its totient is φ = 31504320.

The previous prime is 91887877. The next prime is 91887883. The reversal of 91887880 is 8878819.

It is an interprime number because it is at equal distance from previous prime (91887877) and next prime (91887883).

It is not an unprimeable number, because it can be changed into a prime (91887883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163806 + ... + 164365.

It is an arithmetic number, because the mean of its divisors is an integer number (7383870).

Almost surely, 2^91887880 is an apocalyptic number.

It is an amenable number.

91887880 is an abundant number, since it is smaller than the sum of its proper divisors (144395960).

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

91887880 is a wasteful number, since it uses less digits than its factorization.

91887880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328189 (or 328185 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 49.

The square root of 91887880 is about 9585.8166057984. The cubic root of 91887880 is about 451.2522814064.

The spelling of 91887880 in words is "ninety-one million, eight hundred eighty-seven thousand, eight hundred eighty".