91420740 has 72 divisors (see below), whose sum is σ = 280058688. Its totient is φ = 24137280.

The previous prime is 91420697. The next prime is 91420751. The reversal of 91420740 is 4702419.

It is a happy number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 16075 + ... + 21005.

It is an arithmetic number, because the mean of its divisors is an integer number (3889704).

Almost surely, 2^91420740 is an apocalyptic number.

91420740 is a gapful number since it is divisible by the number (90) 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 91420740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140029344).

91420740 is an abundant number, since it is smaller than the sum of its proper divisors (188637948).

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

91420740 is a wasteful number, since it uses less digits than its factorization.

91420740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5049 (or 5044 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 91420740 is about 9561.4193507031. The cubic root of 91420740 is about 450.4862891208.

The spelling of 91420740 in words is "ninety-one million, four hundred twenty thousand, seven hundred forty".