881643906 has 256 divisors, whose sum is σ = 2477260800. Its totient is φ = 228614400.

The previous prime is 881643901. The next prime is 881643913. The reversal of 881643906 is 609346188.

It is not an unprimeable number, because it can be changed into a prime (881643901) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6942015 + ... + 6942141.

It is an arithmetic number, because the mean of its divisors is an integer number (9676800).

Almost surely, 2^881643906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 881643906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238630400).

881643906 is an abundant number, since it is smaller than the sum of its proper divisors (1595616894).

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

881643906 is a wasteful number, since it uses less digits than its factorization.

881643906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 881643906 is about 29692.4890502632. The cubic root of 881643906 is about 958.8803156713.

The spelling of 881643906 in words is "eight hundred eighty-one million, six hundred forty-three thousand, nine hundred six".