81002088 has 24 divisors (see below), whose sum is σ = 219380850. Its totient is φ = 27000672.

The previous prime is 81002071. The next prime is 81002099. The reversal of 81002088 is 88020018.

It can be written as a sum of positive squares in only one way, i.e., 77475204 + 3526884 = 8802^2 + 1878^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×81002088² = 13122676520719488, which contains 22 as substring.

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, 562443 + ... + 562586.

Almost surely, 2^81002088 is an apocalyptic number.

It is an amenable number.

81002088 is an abundant number, since it is smaller than the sum of its proper divisors (138378762).

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

81002088 is a wasteful number, since it uses less digits than its factorization.

81002088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125041 (or 1125034 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 81002088 is about 9000.1159992525. The cubic root of 81002088 is about 432.6785888592.

The spelling of 81002088 in words is "eighty-one million, two thousand, eighty-eight".