81368002 has 8 divisors (see below), whose sum is σ = 122092812. Its totient is φ = 40670400.

The previous prime is 81367991. The next prime is 81368003. The reversal of 81368002 is 20086318.

It can be written as a sum of positive squares in 2 ways, for example, as 79727041 + 1640961 = 8929^2 + 1281^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81368003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4302 + ... + 13462.

Almost surely, 2^81368002 is an apocalyptic number.

81368002 is a deficient number, since it is larger than the sum of its proper divisors (40724810).

81368002 is a wasteful number, since it uses less digits than its factorization.

81368002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13604.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 81368002 is about 9020.4213870528. The cubic root of 81368002 is about 433.3291290848.

The spelling of 81368002 in words is "eighty-one million, three hundred sixty-eight thousand, two".