81789038 has 8 divisors (see below), whose sum is σ = 123369480. Its totient is φ = 40665880.

The previous prime is 81789031. The next prime is 81789049. The reversal of 81789038 is 83098718.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81789038.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81789031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113873 + ... + 114588.

It is an arithmetic number, because the mean of its divisors is an integer number (15421185).

Almost surely, 2^81789038 is an apocalyptic number.

81789038 is a deficient number, since it is larger than the sum of its proper divisors (41580442).

81789038 is a wasteful number, since it uses less digits than its factorization.

81789038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228642.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 81789038 is about 9043.7292086838. The cubic root of 81789038 is about 434.0752593052.

The spelling of 81789038 in words is "eighty-one million, seven hundred eighty-nine thousand, thirty-eight".