891140544 has 168 divisors, whose sum is σ = 3091147488. Its totient is φ = 239616000.

The previous prime is 891140533. The next prime is 891140567. The reversal of 891140544 is 445041198.

891140544 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 (168).

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

It is a junction number, because it is equal to n+sod(n) for n = 891140499 and 891140508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62044 + ... + 75044.

Almost surely, 2^891140544 is an apocalyptic number.

891140544 is a gapful number since it is divisible by the number (84) 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 891140544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1545573744).

891140544 is an abundant number, since it is smaller than the sum of its proper divisors (2200006944).

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

891140544 is a wasteful number, since it uses less digits than its factorization.

891140544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13043 (or 13030 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 891140544 is about 29851.9772209480. The cubic root of 891140544 is about 962.3108911429.

It can be divided in two parts, 8911 and 40544, that added together give a triangular number (49455 = T₃₁₄).

The spelling of 891140544 in words is "eight hundred ninety-one million, one hundred forty thousand, five hundred forty-four".