81073838 has 8 divisors (see below), whose sum is σ = 122977440. Its totient is φ = 40081360.

The previous prime is 81073813. The next prime is 81073841. The reversal of 81073838 is 83837018.

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

It is a super-3 number, since 3×81073838³ (a number of 25 digits) contains 333 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, 227558 + ... + 227913.

It is an arithmetic number, because the mean of its divisors is an integer number (15372180).

Almost surely, 2^81073838 is an apocalyptic number.

81073838 is a deficient number, since it is larger than the sum of its proper divisors (41903602).

81073838 is a wasteful number, since it uses less digits than its factorization.

81073838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455562.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 81073838 is about 9004.1011766861. The cubic root of 81073838 is about 432.8063037851.

The spelling of 81073838 in words is "eighty-one million, seventy-three thousand, eight hundred thirty-eight".