81965230 has 8 divisors (see below), whose sum is σ = 147537432. Its totient is φ = 32786088.

The previous prime is 81965201. The next prime is 81965231. The reversal of 81965230 is 3256918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81965231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4098252 + ... + 4098271.

It is an arithmetic number, because the mean of its divisors is an integer number (18442179).

Almost surely, 2^81965230 is an apocalyptic number.

81965230 is a deficient number, since it is larger than the sum of its proper divisors (65572202).

81965230 is a wasteful number, since it uses less digits than its factorization.

81965230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8196530.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 81965230 is about 9053.4650824974. The cubic root of 81965230 is about 434.3867343586.

It can be divided in two parts, 819 and 65230, that added together give a square (66049 = 257²).

The spelling of 81965230 in words is "eighty-one million, nine hundred sixty-five thousand, two hundred thirty".