81098388 has 48 divisors (see below), whose sum is σ = 240293760. Its totient is φ = 23170752.

The previous prime is 81098377. The next prime is 81098393. The reversal of 81098388 is 88389018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52881 + ... + 54392.

It is an arithmetic number, because the mean of its divisors is an integer number (5006120).

Almost surely, 2^81098388 is an apocalyptic number.

It is an amenable number.

81098388 is an abundant number, since it is smaller than the sum of its proper divisors (159195372).

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

81098388 is a wasteful number, since it uses less digits than its factorization.

81098388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107293 (or 107285 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The square root of 81098388 is about 9005.4643411653. The cubic root of 81098388 is about 432.8499854573.

The spelling of 81098388 in words is "eighty-one million, ninety-eight thousand, three hundred eighty-eight".