81268750 has 24 divisors (see below), whose sum is σ = 152380872. Its totient is φ = 32505000.

The previous prime is 81268739. The next prime is 81268777. The reversal of 81268750 is 5786218.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 252 + ... + 12751.

It is an arithmetic number, because the mean of its divisors is an integer number (6349203).

Almost surely, 2^81268750 is an apocalyptic number.

81268750 is a deficient number, since it is larger than the sum of its proper divisors (71112122).

81268750 is an equidigital number, since it uses as much as digits as its factorization.

81268750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13030 (or 13010 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 81268750 is about 9014.9181915312. The cubic root of 81268750 is about 433.1528669966.

The spelling of 81268750 in words is "eighty-one million, two hundred sixty-eight thousand, seven hundred fifty".