81003857 has 8 divisors (see below), whose sum is σ = 88504032. Its totient is φ = 73526400.

The previous prime is 81003817. The next prime is 81003869. The reversal of 81003857 is 75830018.

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

It is a cyclic number.

It is not a de Polignac number, because 81003857 - 2¹⁶ = 80938321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81003817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2273 + ... + 12929.

It is an arithmetic number, because the mean of its divisors is an integer number (11063004).

Almost surely, 2^81003857 is an apocalyptic number.

It is an amenable number.

81003857 is a deficient number, since it is larger than the sum of its proper divisors (7500175).

81003857 is a wasteful number, since it uses less digits than its factorization.

81003857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11359.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 81003857 is about 9000.2142752270. The cubic root of 81003857 is about 432.6817385840.

The spelling of 81003857 in words is "eighty-one million, three thousand, eight hundred fifty-seven".