81360002 has 4 divisors (see below), whose sum is σ = 122040006. Its totient is φ = 40680000.

The previous prime is 81360001. The next prime is 81360029. The reversal of 81360002 is 20006318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20006318 = 2 ⋅10003159.

It can be written as a sum of positive squares in only one way, i.e., 65431921 + 15928081 = 8089^2 + 3991^2 .

It is not an unprimeable number, because it can be changed into a prime (81360001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20339999 + ... + 20340002.

Almost surely, 2^81360002 is an apocalyptic number.

81360002 is a deficient number, since it is larger than the sum of its proper divisors (40680004).

81360002 is a wasteful number, since it uses less digits than its factorization.

81360002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40680003.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 81360002 is about 9019.9779378888. The cubic root of 81360002 is about 433.3149271603.

The spelling of 81360002 in words is "eighty-one million, three hundred sixty thousand, two".