91491792 has 80 divisors (see below), whose sum is σ = 281886720. Its totient is φ = 25001856.

The previous prime is 91491791. The next prime is 91491797. The reversal of 91491792 is 29719419.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91491791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1809 + ... + 13647.

It is an arithmetic number, because the mean of its divisors is an integer number (3523584).

Almost surely, 2^91491792 is an apocalyptic number.

91491792 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91491792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140943360).

91491792 is an abundant number, since it is smaller than the sum of its proper divisors (190394928).

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

91491792 is a wasteful number, since it uses less digits than its factorization.

91491792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11880 (or 11874 counting only the distinct ones).

The product of its digits is 40824, while the sum is 42.

The square root of 91491792 is about 9565.1341861994. The cubic root of 91491792 is about 450.6029645536.

The spelling of 91491792 in words is "ninety-one million, four hundred ninety-one thousand, seven hundred ninety-two".