891888198 has 32 divisors (see below), whose sum is σ = 1855214592. Its totient is φ = 285616800.

The previous prime is 891888169. The next prime is 891888199.

891888198 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891888199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12598 + ... + 44073.

It is an arithmetic number, because the mean of its divisors is an integer number (57975456).

Almost surely, 2^891888198 is an apocalyptic number.

891888198 is an abundant number, since it is smaller than the sum of its proper divisors (963326394).

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

891888198 is a wasteful number, since it uses less digits than its factorization.

891888198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56780.

The product of its digits is 2654208, while the sum is 60.

The square root of 891888198 is about 29864.4972835640. The cubic root of 891888198 is about 962.5799375448.

The spelling of 891888198 in words is "eight hundred ninety-one million, eight hundred eighty-eight thousand, one hundred ninety-eight".