91987734 has 8 divisors (see below), whose sum is σ = 183975480. Its totient is φ = 30662576.

The previous prime is 91987729. The next prime is 91987769. The reversal of 91987734 is 43778919.

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

91987734 is an admirable number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 7665639 + ... + 7665650.

It is an arithmetic number, because the mean of its divisors is an integer number (22996935).

Almost surely, 2^91987734 is an apocalyptic number.

91987734 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.

91987734 is a wasteful number, since it uses less digits than its factorization.

91987734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15331294.

The product of its digits is 381024, while the sum is 48.

The square root of 91987734 is about 9591.0236158608. The cubic root of 91987734 is about 451.4156799353.

The spelling of 91987734 in words is "ninety-one million, nine hundred eighty-seven thousand, seven hundred thirty-four".