81230770 has 8 divisors (see below), whose sum is σ = 146215404. Its totient is φ = 32492304.

The previous prime is 81230767. The next prime is 81230803. The reversal of 81230770 is 7703218.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 79548561 + 1682209 = 8919^2 + 1297^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4061529 + ... + 4061548.

Almost surely, 2^81230770 is an apocalyptic number.

81230770 is a deficient number, since it is larger than the sum of its proper divisors (64984634).

81230770 is a wasteful number, since it uses less digits than its factorization.

81230770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8123084.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 81230770 is about 9012.8114370600. The cubic root of 81230770 is about 433.0853801733.

Adding to 81230770 its reverse (7703218), we get a palindrome (88933988).

The spelling of 81230770 in words is "eighty-one million, two hundred thirty thousand, seven hundred seventy".