81002268 has 30 divisors (see below), whose sum is σ = 211756776. Its totient is φ = 27000648.

The previous prime is 81002261. The next prime is 81002309. The reversal of 81002268 is 86220018.

It is a super-2 number, since 2×81002268² = 13122734842287648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81002261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 124680 + ... + 125327.

Almost surely, 2^81002268 is an apocalyptic number.

It is an amenable number.

81002268 is an abundant number, since it is smaller than the sum of its proper divisors (130754508).

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

81002268 is a wasteful number, since it uses less digits than its factorization.

81002268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250023 (or 250012 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 81002268 is about 9000.1259991180. The cubic root of 81002268 is about 432.6789093533.

The spelling of 81002268 in words is "eighty-one million, two thousand, two hundred sixty-eight".