81812703 has 32 divisors (see below), whose sum is σ = 130240000. Its totient is φ = 45662904.

The previous prime is 81812693. The next prime is 81812707. The reversal of 81812703 is 30721818.

It is a happy number.

It is an ABA number since it can be written as A⋅B^A, here for A=3, B=301.

It is not a de Polignac number, because 81812703 - 2⁶ = 81812639 is a prime.

It is a super-4 number, since 4×81812703⁴ (a number of 33 digits) contains 4444 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81812707) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1902600 + ... + 1902642.

It is an arithmetic number, because the mean of its divisors is an integer number (4070000).

Almost surely, 2^81812703 is an apocalyptic number.

81812703 is a deficient number, since it is larger than the sum of its proper divisors (48427297).

81812703 is an frugal number, since it uses more digits than its factorization.

81812703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 81812703 is about 9045.0374791927. The cubic root of 81812703 is about 434.1171206625.

The spelling of 81812703 in words is "eighty-one million, eight hundred twelve thousand, seven hundred three".