81025886 has 8 divisors (see below), whose sum is σ = 121605960. Its totient is φ = 40490568.

The previous prime is 81025871. The next prime is 81025891. The reversal of 81025886 is 68852018.

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

It is a congruent number.

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, 6221 + ... + 14168.

It is an arithmetic number, because the mean of its divisors is an integer number (15200745).

Almost surely, 2^81025886 is an apocalyptic number.

81025886 is a deficient number, since it is larger than the sum of its proper divisors (40580074).

81025886 is a wasteful number, since it uses less digits than its factorization.

81025886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22378.

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 81025886 is about 9001.4379962315. The cubic root of 81025886 is about 432.7209576305.

The spelling of 81025886 in words is "eighty-one million, twenty-five thousand, eight hundred eighty-six".