81206288398 has 16 divisors (see below), whose sum is σ = 128997323280. Its totient is φ = 38208018816.

The previous prime is 81206288353. The next prime is 81206288441. The reversal of 81206288398 is 89388260218.

It is a happy number.

It is a super-2 number, since 2×81206288398² (a number of 23 digits) contains 22 as substring.

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, 10161 + ... + 403132.

It is an arithmetic number, because the mean of its divisors is an integer number (8062332705).

Almost surely, 2^81206288398 is an apocalyptic number.

81206288398 is a deficient number, since it is larger than the sum of its proper divisors (47791034882).

81206288398 is a wasteful number, since it uses less digits than its factorization.

81206288398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419091.

The product of its (nonzero) digits is 2654208, while the sum is 55.

The spelling of 81206288398 in words is "eighty-one billion, two hundred six million, two hundred eighty-eight thousand, three hundred ninety-eight".