81227748 has 24 divisors (see below), whose sum is σ = 216607552. Its totient is φ = 23207904.

The previous prime is 81227723. The next prime is 81227749. The reversal of 81227748 is 84772218.

It is not an unprimeable number, because it can be changed into a prime (81227749) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 483415 + ... + 483582.

Almost surely, 2^81227748 is an apocalyptic number.

It is an amenable number.

81227748 is an abundant number, since it is smaller than the sum of its proper divisors (135379804).

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

81227748 is a wasteful number, since it uses less digits than its factorization.

81227748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967011 (or 967009 counting only the distinct ones).

The product of its digits is 50176, while the sum is 39.

The square root of 81227748 is about 9012.6437852608. The cubic root of 81227748 is about 433.0800094653.

The spelling of 81227748 in words is "eighty-one million, two hundred twenty-seven thousand, seven hundred forty-eight".