81706276 has 12 divisors (see below), whose sum is σ = 146473740. Its totient is φ = 39856640.

The previous prime is 81706259. The next prime is 81706277. The reversal of 81706276 is 67260718.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13147876 + 68558400 = 3626^2 + 8280^2 .

It is not an unprimeable number, because it can be changed into a prime (81706277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248941 + ... + 249268.

It is an arithmetic number, because the mean of its divisors is an integer number (12206145).

Almost surely, 2^81706276 is an apocalyptic number.

It is an amenable number.

81706276 is a deficient number, since it is larger than the sum of its proper divisors (64767464).

81706276 is a wasteful number, since it uses less digits than its factorization.

81706276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498254 (or 498252 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 81706276 is about 9039.1523938918. The cubic root of 81706276 is about 433.9287968871.

The spelling of 81706276 in words is "eighty-one million, seven hundred six thousand, two hundred seventy-six".