81075830 has 16 divisors (see below), whose sum is σ = 159203664. Its totient is φ = 29482080.

The previous prime is 81075809. The next prime is 81075833. The reversal of 81075830 is 3857018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81075833) 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, 368417 + ... + 368636.

It is an arithmetic number, because the mean of its divisors is an integer number (9950229).

Almost surely, 2^81075830 is an apocalyptic number.

81075830 is a deficient number, since it is larger than the sum of its proper divisors (78127834).

81075830 is a wasteful number, since it uses less digits than its factorization.

81075830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737071.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 81075830 is about 9004.2117922670. The cubic root of 81075830 is about 432.8098484678.

The spelling of 81075830 in words is "eighty-one million, seventy-five thousand, eight hundred thirty".