81284008 has 32 divisors (see below), whose sum is σ = 164896200. Its totient is φ = 37340928.

The previous prime is 81283997. The next prime is 81284029. The reversal of 81284008 is 80048218.

It can be written as a sum of positive squares in 4 ways, for example, as 81036004 + 248004 = 9002^2 + 498^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22110 + ... + 25522.

Almost surely, 2^81284008 is an apocalyptic number.

It is an amenable number.

81284008 is an abundant number, since it is smaller than the sum of its proper divisors (83612192).

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

81284008 is a wasteful number, since it uses less digits than its factorization.

81284008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3661 (or 3657 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 81284008 is about 9015.7644157331. The cubic root of 81284008 is about 433.1799730814.

It can be divided in two parts, 81 and 284008, that added together give a square (284089 = 533²).

The spelling of 81284008 in words is "eighty-one million, two hundred eighty-four thousand, eight".