80917605 has 24 divisors (see below), whose sum is σ = 141507288. Its totient is φ = 42771456.

The previous prime is 80917589. The next prime is 80917607. The reversal of 80917605 is 50671908.

It can be written as a sum of positive squares in 4 ways, for example, as 2169729 + 78747876 = 1473^2 + 8874^2 .

It is not a de Polignac number, because 80917605 - 2⁴ = 80917589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80917605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80917607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2872 + ... + 13041.

It is an arithmetic number, because the mean of its divisors is an integer number (5896137).

Almost surely, 2^80917605 is an apocalyptic number.

It is an amenable number.

80917605 is a deficient number, since it is larger than the sum of its proper divisors (60589683).

80917605 is a wasteful number, since it uses less digits than its factorization.

80917605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16037 (or 16034 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 80917605 is about 8995.4213353239. The cubic root of 80917605 is about 432.5281124876.

The spelling of 80917605 in words is "eighty million, nine hundred seventeen thousand, six hundred five".