81247108 has 12 divisors (see below), whose sum is σ = 142286032. Its totient is φ = 40593960.

The previous prime is 81247091. The next prime is 81247141. The reversal of 81247108 is 80174218.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81247108.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 510 + ... + 12757.

Almost surely, 2^81247108 is an apocalyptic number.

It is an amenable number.

81247108 is a deficient number, since it is larger than the sum of its proper divisors (61038924).

81247108 is a wasteful number, since it uses less digits than its factorization.

81247108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14802 (or 14800 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 81247108 is about 9013.7177679357. The cubic root of 81247108 is about 433.1144138126.

The spelling of 81247108 in words is "eighty-one million, two hundred forty-seven thousand, one hundred eight".