81969008 has 40 divisors (see below), whose sum is σ = 177298176. Its totient is φ = 36388800.

The previous prime is 81969007. The next prime is 81969029. The reversal of 81969008 is 80096918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81969007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2153 + ... + 12983.

Almost surely, 2^81969008 is an apocalyptic number.

81969008 is a gapful number since it is divisible by the number (88) 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 81969008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88649088).

81969008 is an abundant number, since it is smaller than the sum of its proper divisors (95329168).

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

81969008 is a wasteful number, since it uses less digits than its factorization.

81969008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10893 (or 10887 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 81969008 is about 9053.6737294868. The cubic root of 81969008 is about 434.3934082774.

The spelling of 81969008 in words is "eighty-one million, nine hundred sixty-nine thousand, eight".