81162928 has 120 divisors (see below), whose sum is σ = 203049504. Its totient is φ = 30750720.

The previous prime is 81162923. The next prime is 81162931. The reversal of 81162928 is 82926118.

It is not an unprimeable number, because it can be changed into a prime (81162923) by changing a digit.

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, 718200 + ... + 718312.

Almost surely, 2^81162928 is an apocalyptic number.

81162928 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 81162928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101524752).

81162928 is an abundant number, since it is smaller than the sum of its proper divisors (121886576).

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

81162928 is a wasteful number, since it uses less digits than its factorization.

81162928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 186 counting only the distinct ones).

The product of its digits is 13824, while the sum is 37.

The square root of 81162928 is about 9009.0470084244. The cubic root of 81162928 is about 432.9647790690.

The spelling of 81162928 in words is "eighty-one million, one hundred sixty-two thousand, nine hundred twenty-eight".