81098290 has 32 divisors (see below), whose sum is σ = 179665920. Its totient is φ = 25665984.

The previous prime is 81098261. The next prime is 81098291. The reversal of 81098290 is 9289018.

It is not an unprimeable number, because it can be changed into a prime (81098291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43650 + ... + 45469.

It is an arithmetic number, because the mean of its divisors is an integer number (5614560).

Almost surely, 2^81098290 is an apocalyptic number.

81098290 is an abundant number, since it is smaller than the sum of its proper divisors (98567630).

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

81098290 is a wasteful number, since it uses less digits than its factorization.

81098290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89146.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 81098290 is about 9005.4589000228. The cubic root of 81098290 is about 432.8498111040.

The spelling of 81098290 in words is "eighty-one million, ninety-eight thousand, two hundred ninety".