881640 has 96 divisors (see below), whose sum is σ = 2995200. Its totient is φ = 224640.

The previous prime is 881611. The next prime is 881641. The reversal of 881640 is 46188.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (881641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11121 + ... + 11199.

It is an arithmetic number, because the mean of its divisors is an integer number (31200).

2⁸⁸¹⁶⁴⁰ 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 881640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1497600).

881640 is an abundant number, since it is smaller than the sum of its proper divisors (2113560).

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

881640 is a wasteful number, since it uses less digits than its factorization.

881640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 881640 is about 938.9568680190. The cubic root of 881640 is about 95.8878899607.

It can be divided in two parts, 881 and 640, that added together give a square (1521 = 39²).

The spelling of 881640 in words is "eight hundred eighty-one thousand, six hundred forty".