891023616 has 216 divisors, whose sum is σ = 2970537024. Its totient is φ = 251596800.

The previous prime is 891023593. The next prime is 891023633. The reversal of 891023616 is 616320198.

891023616 is a `hidden beast` number, since 8 + 9 + 10 + 23 + 616 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1628655 + ... + 1629201.

Almost surely, 2^891023616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 891023616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1485268512).

891023616 is an abundant number, since it is smaller than the sum of its proper divisors (2079513408).

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

891023616 is a wasteful number, since it uses less digits than its factorization.

891023616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677 (or 660 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 891023616 is about 29850.0186934615. The cubic root of 891023616 is about 962.2688005096.

The spelling of 891023616 in words is "eight hundred ninety-one million, twenty-three thousand, six hundred sixteen".