81027487 has 4 divisors (see below), whose sum is σ = 81106960. Its totient is φ = 80948016.

The previous prime is 81027451. The next prime is 81027493. The reversal of 81027487 is 78472018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81027487 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 (81027497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38187 + ... + 40252.

It is an arithmetic number, because the mean of its divisors is an integer number (20276740).

Almost surely, 2^81027487 is an apocalyptic number.

81027487 is a deficient number, since it is larger than the sum of its proper divisors (79473).

81027487 is a wasteful number, since it uses less digits than its factorization.

81027487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79472.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 81027487 is about 9001.5269260276. The cubic root of 81027487 is about 432.7238076731.

The spelling of 81027487 in words is "eighty-one million, twenty-seven thousand, four hundred eighty-seven".