891998000 has 80 divisors (see below), whose sum is σ = 2163316896. Its totient is φ = 355731200.

The previous prime is 891997969. The next prime is 891998011. The reversal of 891998000 is 899198.

891998000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

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, 1305659 + ... + 1306341.

Almost surely, 2^891998000 is an apocalyptic number.

891998000 is a gapful number since it is divisible by the number (80) 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 891998000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1081658448).

891998000 is an abundant number, since it is smaller than the sum of its proper divisors (1271318896).

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

891998000 is a wasteful number, since it uses less digits than its factorization.

891998000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1359 (or 1343 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 891998000 is about 29866.3355636409. The cubic root of 891998000 is about 962.6194375873.

The spelling of 891998000 in words is "eight hundred ninety-one million, nine hundred ninety-eight thousand".