81789037 has 8 divisors (see below), whose sum is σ = 89742240. Its totient is φ = 73922160.

The previous prime is 81789031. The next prime is 81789049. The reversal of 81789037 is 73098718.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81789037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81788984 and 81789002.

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 7 ways as a sum of consecutive naturals, for example, 19587 + ... + 23392.

It is an arithmetic number, because the mean of its divisors is an integer number (11217780).

Almost surely, 2^81789037 is an apocalyptic number.

It is an amenable number.

81789037 is a deficient number, since it is larger than the sum of its proper divisors (7953203).

81789037 is a wasteful number, since it uses less digits than its factorization.

81789037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43163.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 81789037 is about 9043.7291533968. The cubic root of 81789037 is about 434.0752575362.

The spelling of 81789037 in words is "eighty-one million, seven hundred eighty-nine thousand, thirty-seven".