81027615 has 8 divisors (see below), whose sum is σ = 129644208. Its totient is φ = 43214720.

The previous prime is 81027613. The next prime is 81027641. The reversal of 81027615 is 51672018.

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

It is not a de Polignac number, because 81027615 - 2¹ = 81027613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81027613) 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 7 ways as a sum of consecutive naturals, for example, 2700906 + ... + 2700935.

It is an arithmetic number, because the mean of its divisors is an integer number (16205526).

Almost surely, 2^81027615 is an apocalyptic number.

81027615 is a deficient number, since it is larger than the sum of its proper divisors (48616593).

81027615 is a wasteful number, since it uses less digits than its factorization.

81027615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5401849.

The product of its (nonzero) digits is 3360, while the sum is 30.

The square root of 81027615 is about 9001.5340359297. The cubic root of 81027615 is about 432.7240355325.

The spelling of 81027615 in words is "eighty-one million, twenty-seven thousand, six hundred fifteen".