81650727 has 8 divisors (see below), whose sum is σ = 120964080. Its totient is φ = 54433800.

The previous prime is 81650707. The next prime is 81650743. The reversal of 81650727 is 72705618.

It is not a de Polignac number, because 81650727 - 2⁶ = 81650663 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 81650691 and 81650700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81650707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1512024 + ... + 1512077.

It is an arithmetic number, because the mean of its divisors is an integer number (15120510).

Almost surely, 2^81650727 is an apocalyptic number.

81650727 is a deficient number, since it is larger than the sum of its proper divisors (39313353).

81650727 is a wasteful number, since it uses less digits than its factorization.

81650727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3024110 (or 3024104 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 81650727 is about 9036.0791829200. The cubic root of 81650727 is about 433.8304373464.

The spelling of 81650727 in words is "eighty-one million, six hundred fifty thousand, seven hundred twenty-seven".