91783140 has 48 divisors (see below), whose sum is σ = 258370560. Its totient is φ = 24344320.

The previous prime is 91783117. The next prime is 91783141. The reversal of 91783140 is 4138719.

It is not an unprimeable number, because it can be changed into a prime (91783141) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7456 + ... + 15464.

It is an arithmetic number, because the mean of its divisors is an integer number (5382720).

Almost surely, 2^91783140 is an apocalyptic number.

It is an amenable number.

91783140 is an abundant number, since it is smaller than the sum of its proper divisors (166587420).

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

91783140 is a wasteful number, since it uses less digits than its factorization.

91783140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8212 (or 8210 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 91783140 is about 9580.3517680720. The cubic root of 91783140 is about 451.0807602960.

The spelling of 91783140 in words is "ninety-one million, seven hundred eighty-three thousand, one hundred forty".