91273770 has 96 divisors (see below), whose sum is σ = 283176000. Its totient is φ = 20859552.

The previous prime is 91273769. The next prime is 91273771. The reversal of 91273770 is 7737219.

It is an interprime number because it is at equal distance from previous prime (91273769) and next prime (91273771).

It is not an unprimeable number, because it can be changed into a prime (91273771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9781 + ... + 16679.

It is an arithmetic number, because the mean of its divisors is an integer number (2949750).

Almost surely, 2^91273770 is an apocalyptic number.

91273770 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 91273770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141588000).

91273770 is an abundant number, since it is smaller than the sum of its proper divisors (191902230).

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

91273770 is a wasteful number, since it uses less digits than its factorization.

91273770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6929 (or 6916 counting only the distinct ones).

The product of its (nonzero) digits is 18522, while the sum is 36.

The square root of 91273770 is about 9553.7306849209. The cubic root of 91273770 is about 450.2447557417.

The spelling of 91273770 in words is "ninety-one million, two hundred seventy-three thousand, seven hundred seventy".