91690434 has 64 divisors (see below), whose sum is σ = 223879680. Its totient is φ = 27585360.

The previous prime is 91690433. The next prime is 91690441. The reversal of 91690434 is 43409619.

It is not an unprimeable number, because it can be changed into a prime (91690433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96349 + ... + 97295.

It is an arithmetic number, because the mean of its divisors is an integer number (3498120).

Almost surely, 2^91690434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91690434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111939840).

91690434 is an abundant number, since it is smaller than the sum of its proper divisors (132189246).

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

91690434 is a wasteful number, since it uses less digits than its factorization.

91690434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132 (or 1126 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 91690434 is about 9575.5122056212. The cubic root of 91690434 is about 450.9288370404.

The spelling of 91690434 in words is "ninety-one million, six hundred ninety thousand, four hundred thirty-four".