81899230 has 32 divisors (see below), whose sum is σ = 168848064. Its totient is φ = 28018176.

The previous prime is 81899227. The next prime is 81899231. The reversal of 81899230 is 3299818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81899231) 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, 40524 + ... + 42496.

It is an arithmetic number, because the mean of its divisors is an integer number (5276502).

Almost surely, 2^81899230 is an apocalyptic number.

81899230 is an abundant number, since it is smaller than the sum of its proper divisors (86948834).

81899230 is a wasteful number, since it uses less digits than its factorization.

81899230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 81899230 is about 9049.8193352133. The cubic root of 81899230 is about 434.2701108301.

The spelling of 81899230 in words is "eighty-one million, eight hundred ninety-nine thousand, two hundred thirty".