81027007 has 16 divisors (see below), whose sum is σ = 85333248. Its totient is φ = 76870080.

The previous prime is 81026987. The next prime is 81027019. The reversal of 81027007 is 70072018.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81027007 - 2¹¹ = 81024959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81027047) 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, 260382 + ... + 260692.

It is an arithmetic number, because the mean of its divisors is an integer number (5333328).

Almost surely, 2^81027007 is an apocalyptic number.

81027007 is a deficient number, since it is larger than the sum of its proper divisors (4306241).

81027007 is a wasteful number, since it uses less digits than its factorization.

81027007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510.

The product of its (nonzero) digits is 784, while the sum is 25.

The square root of 81027007 is about 9001.5002638449. The cubic root of 81027007 is about 432.7229531983.

The spelling of 81027007 in words is "eighty-one million, twenty-seven thousand, seven".