91045784 has 8 divisors (see below), whose sum is σ = 170710860. Its totient is φ = 45522888.

The previous prime is 91045783. The next prime is 91045811. The reversal of 91045784 is 48754019.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91045781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5690354 + ... + 5690369.

Almost surely, 2^91045784 is an apocalyptic number.

It is an amenable number.

91045784 is a deficient number, since it is larger than the sum of its proper divisors (79665076).

91045784 is a wasteful number, since it uses less digits than its factorization.

91045784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11380729 (or 11380725 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 91045784 is about 9541.7914460546. The cubic root of 91045784 is about 449.8695654888.

The spelling of 91045784 in words is "ninety-one million, forty-five thousand, seven hundred eighty-four".