91098000 has 320 divisors, whose sum is σ = 374499840. Its totient is φ = 20736000.

The previous prime is 91097987. The next prime is 91098031. The reversal of 91098000 is 89019.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 377880 + ... + 378120.

It is an arithmetic number, because the mean of its divisors is an integer number (1170312).

Almost surely, 2^91098000 is an apocalyptic number.

91098000 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 91098000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187249920).

91098000 is an abundant number, since it is smaller than the sum of its proper divisors (283401840).

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

91098000 is a wasteful number, since it uses less digits than its factorization.

91098000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 91098000 is about 9544.5272276839. The cubic root of 91098000 is about 449.9555511653.

The spelling of 91098000 in words is "ninety-one million, ninety-eight thousand".