81000838 has 8 divisors (see below), whose sum is σ = 127896120. Its totient is φ = 38368800.

The previous prime is 81000809. The next prime is 81000841. The reversal of 81000838 is 83800018.

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

It is a super-2 number, since 2×81000838² = 13122271513404488, which contains 22 as substring.

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, 1065763 + ... + 1065838.

It is an arithmetic number, because the mean of its divisors is an integer number (15987015).

Almost surely, 2^81000838 is an apocalyptic number.

81000838 is a deficient number, since it is larger than the sum of its proper divisors (46895282).

81000838 is a wasteful number, since it uses less digits than its factorization.

81000838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2131622.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 81000838 is about 9000.0465554351. The cubic root of 81000838 is about 432.6763631922.

It can be divided in two parts, 810008 and 38, that multiplied together give a square (30780304 = 5548²).

The spelling of 81000838 in words is "eighty-one million, eight hundred thirty-eight", and thus it is an aban number.