91987370 has 16 divisors (see below), whose sum is σ = 166883328. Its totient is φ = 36504720.

The previous prime is 91987367. The next prime is 91987381. The reversal of 91987370 is 7378919.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 34946 + ... + 37485.

It is an arithmetic number, because the mean of its divisors is an integer number (10430208).

Almost surely, 2^91987370 is an apocalyptic number.

91987370 is a deficient number, since it is larger than the sum of its proper divisors (74895958).

91987370 is a wasteful number, since it uses less digits than its factorization.

91987370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72565.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 91987370 is about 9591.0046397653. The cubic root of 91987370 is about 451.4150845098.

The spelling of 91987370 in words is "ninety-one million, nine hundred eighty-seven thousand, three hundred seventy".