81027995 has 4 divisors (see below), whose sum is σ = 97233600. Its totient is φ = 64822392.

The previous prime is 81027983. The next prime is 81028007. The reversal of 81027995 is 59972018.

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

It is an interprime number because it is at equal distance from previous prime (81027983) and next prime (81028007).

It is a cyclic number.

It is not a de Polignac number, because 81027995 - 2⁴ = 81027979 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8102795 + ... + 8102804.

It is an arithmetic number, because the mean of its divisors is an integer number (24308400).

Almost surely, 2^81027995 is an apocalyptic number.

81027995 is a deficient number, since it is larger than the sum of its proper divisors (16205605).

81027995 is a wasteful number, since it uses less digits than its factorization.

81027995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16205604.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 81027995 is about 9001.5551434183. Note that the first 3 decimals coincide. The cubic root of 81027995 is about 432.7247119886.

The spelling of 81027995 in words is "eighty-one million, twenty-seven thousand, nine hundred ninety-five".