81290718 has 12 divisors (see below), whose sum is σ = 176129928. Its totient is φ = 27096900.

The previous prime is 81290707. The next prime is 81290723. The reversal of 81290718 is 81709218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2258058 + ... + 2258093.

It is an arithmetic number, because the mean of its divisors is an integer number (14677494).

Almost surely, 2^81290718 is an apocalyptic number.

81290718 is an abundant number, since it is smaller than the sum of its proper divisors (94839210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81290718 is a wasteful number, since it uses less digits than its factorization.

81290718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4516159 (or 4516156 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 81290718 is about 9016.1365340150. The cubic root of 81290718 is about 433.1918924314.

The spelling of 81290718 in words is "eighty-one million, two hundred ninety thousand, seven hundred eighteen".