81223762 has 8 divisors (see below), whose sum is σ = 121985100. Its totient is φ = 40562064.

The previous prime is 81223729. The next prime is 81223763. The reversal of 81223762 is 26732218.

It can be written as a sum of positive squares in 2 ways, for example, as 71927361 + 9296401 = 8481^2 + 3049^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81223763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22837 + ... + 26152.

Almost surely, 2^81223762 is an apocalyptic number.

81223762 is a deficient number, since it is larger than the sum of its proper divisors (40761338).

81223762 is a wasteful number, since it uses less digits than its factorization.

81223762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49820.

The product of its digits is 8064, while the sum is 31.

The square root of 81223762 is about 9012.4226487665. The cubic root of 81223762 is about 433.0729253297.

The spelling of 81223762 in words is "eighty-one million, two hundred twenty-three thousand, seven hundred sixty-two".