81073790 has 16 divisors (see below), whose sum is σ = 166780512. Its totient is φ = 27796704.

The previous prime is 81073789. The next prime is 81073801. The reversal of 81073790 is 9737018.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 81073790.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 579029 + ... + 579168.

It is an arithmetic number, because the mean of its divisors is an integer number (10423782).

Almost surely, 2^81073790 is an apocalyptic number.

81073790 is an abundant number, since it is smaller than the sum of its proper divisors (85706722).

81073790 is a wasteful number, since it uses less digits than its factorization.

81073790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158211.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 81073790 is about 9004.0985112336. The cubic root of 81073790 is about 432.8062183703.

The spelling of 81073790 in words is "eighty-one million, seventy-three thousand, seven hundred ninety".