81033988 has 12 divisors (see below), whose sum is σ = 162068032. Its totient is φ = 34728840.

The previous prime is 81033977. The next prime is 81034007. The reversal of 81033988 is 88933018.

81033988 is an admirable number.

It is a super-2 number, since 2×81033988² = 13133014422368288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81033988.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1447008 + ... + 1447063.

Almost surely, 2^81033988 is an apocalyptic number.

It is an amenable number.

81033988 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81033988 is a wasteful number, since it uses less digits than its factorization.

81033988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2894082 (or 2894080 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 81033988 is about 9001.8880241869. Note that the first 3 decimals coincide. The cubic root of 81033988 is about 432.7353801339.

The spelling of 81033988 in words is "eighty-one million, thirty-three thousand, nine hundred eighty-eight".