91598958 has 128 divisors (see below), whose sum is σ = 241367040. Its totient is φ = 25436160.

The previous prime is 91598951. The next prime is 91598963. The reversal of 91598958 is 85989519.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91598951) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 474510 + ... + 474702.

It is an arithmetic number, because the mean of its divisors is an integer number (1885680).

Almost surely, 2^91598958 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91598958, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120683520).

91598958 is an abundant number, since it is smaller than the sum of its proper divisors (149768082).

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

91598958 is a wasteful number, since it uses less digits than its factorization.

91598958 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279 (or 273 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 54.

The square root of 91598958 is about 9570.7344545756. The cubic root of 91598958 is about 450.7788290564.

The spelling of 91598958 in words is "ninety-one million, five hundred ninety-eight thousand, nine hundred fifty-eight".