90191740 has 48 divisors (see below), whose sum is σ = 204482880. Its totient is φ = 33313280.

The previous prime is 90191663. The next prime is 90191771. The reversal of 90191740 is 4719109.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9960 + ... + 16720.

It is an arithmetic number, because the mean of its divisors is an integer number (4260060).

Almost surely, 2^90191740 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90191740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102241440).

90191740 is an abundant number, since it is smaller than the sum of its proper divisors (114291140).

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

90191740 is a wasteful number, since it uses less digits than its factorization.

90191740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6822 (or 6820 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 90191740 is about 9496.9331891932. The cubic root of 90191740 is about 448.4584950491.

The spelling of 90191740 in words is "ninety million, one hundred ninety-one thousand, seven hundred forty".