80217657 has 12 divisors (see below), whose sum is σ = 124783204. Its totient is φ = 49364640.

The previous prime is 80217653. The next prime is 80217691. The reversal of 80217657 is 75671208.

It can be written as a sum of positive squares in 2 ways, for example, as 3111696 + 77105961 = 1764^2 + 8781^2 .

It is not a de Polignac number, because 80217657 - 2² = 80217653 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80217653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 342694 + ... + 342927.

Almost surely, 2^80217657 is an apocalyptic number.

It is an amenable number.

80217657 is a deficient number, since it is larger than the sum of its proper divisors (44565547).

80217657 is a wasteful number, since it uses less digits than its factorization.

80217657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685640 (or 685637 counting only the distinct ones).

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

The square root of 80217657 is about 8956.4310414361. The cubic root of 80217657 is about 431.2773573067.

The spelling of 80217657 in words is "eighty million, two hundred seventeen thousand, six hundred fifty-seven".