81207248 has 10 divisors (see below), whose sum is σ = 157339074. Its totient is φ = 40603616.

The previous prime is 81207241. The next prime is 81207271. The reversal of 81207248 is 84270218.

It can be written as a sum of positive squares in only one way, i.e., 78357904 + 2849344 = 8852^2 + 1688^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81207241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2537711 + ... + 2537742.

Almost surely, 2^81207248 is an apocalyptic number.

It is an amenable number.

81207248 is a deficient number, since it is larger than the sum of its proper divisors (76131826).

81207248 is a wasteful number, since it uses less digits than its factorization.

81207248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5075461 (or 5075455 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 81207248 is about 9011.5064223469. The cubic root of 81207248 is about 433.0435732827.

The spelling of 81207248 in words is "eighty-one million, two hundred seven thousand, two hundred forty-eight".