81024005 has 16 divisors (see below), whose sum is σ = 99636480. Its totient is φ = 63223872.

The previous prime is 81024001. The next prime is 81024007. The reversal of 81024005 is 50042018.

It is a cyclic number.

It is not a de Polignac number, because 81024005 - 2² = 81024001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81024001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130586 + ... + 131204.

It is an arithmetic number, because the mean of its divisors is an integer number (6227280).

Almost surely, 2^81024005 is an apocalyptic number.

It is an amenable number.

81024005 is a deficient number, since it is larger than the sum of its proper divisors (18612475).

81024005 is a wasteful number, since it uses less digits than its factorization.

81024005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 81024005 is about 9001.3335123192. Note that the first 3 decimals coincide. The cubic root of 81024005 is about 432.7176090940.

The spelling of 81024005 in words is "eighty-one million, twenty-four thousand, five".