81570230 has 32 divisors (see below), whose sum is σ = 176636160. Its totient is φ = 26494560.

The previous prime is 81570227. The next prime is 81570241. The reversal of 81570230 is 3207518.

It is a self number, because there is not a number n which added to its sum of digits gives 81570230.

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, 29336 + ... + 31995.

It is an arithmetic number, because the mean of its divisors is an integer number (5519880).

Almost surely, 2^81570230 is an apocalyptic number.

81570230 is an abundant number, since it is smaller than the sum of its proper divisors (95065930).

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

81570230 is a wasteful number, since it uses less digits than its factorization.

81570230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61364.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 81570230 is about 9031.6238849943. The cubic root of 81570230 is about 433.6878236694.

Adding to 81570230 its reverse (3207518), we get a palindrome (84777748).

The spelling of 81570230 in words is "eighty-one million, five hundred seventy thousand, two hundred thirty".