81120088 has 24 divisors (see below), whose sum is σ = 176933700. Its totient is φ = 34765584.

The previous prime is 81120079. The next prime is 81120113. The reversal of 81120088 is 88002118.

It is a super-4 number, since 4×81120088⁴ (a number of 33 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 103078 + ... + 103861.

Almost surely, 2^81120088 is an apocalyptic number.

It is an amenable number.

81120088 is an abundant number, since it is smaller than the sum of its proper divisors (95813612).

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

81120088 is a wasteful number, since it uses less digits than its factorization.

81120088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206959 (or 206948 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 81120088 is about 9006.6690846283. The cubic root of 81120088 is about 432.8885888018. Note that the first 3 decimals are identical.

The spelling of 81120088 in words is "eighty-one million, one hundred twenty thousand, eighty-eight".