81075708 has 48 divisors (see below), whose sum is σ = 240226560. Its totient is φ = 23164272.

The previous prime is 81075697. The next prime is 81075733. The reversal of 81075708 is 80757018.

81075708 is a `hidden beast` number, since 81 + 0 + 7 + 570 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52866 + ... + 54377.

It is an arithmetic number, because the mean of its divisors is an integer number (5004720).

Almost surely, 2^81075708 is an apocalyptic number.

It is an amenable number.

81075708 is an abundant number, since it is smaller than the sum of its proper divisors (159150852).

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

81075708 is a wasteful number, since it uses less digits than its factorization.

81075708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107263 (or 107255 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 36.

The square root of 81075708 is about 9004.2050176570. The cubic root of 81075708 is about 432.8096313755.

The spelling of 81075708 in words is "eighty-one million, seventy-five thousand, seven hundred eight".