820060657 has 4 divisors (see below), whose sum is σ = 883142260. Its totient is φ = 756979056.

The previous prime is 820060651. The next prime is 820060723. The reversal of 820060657 is 756060028.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41873841 + 778186816 = 6471^2 + 27896^2 .

It is a cyclic number.

It is not a de Polignac number, because 820060657 - 2³ = 820060649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (820060651) 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 3 ways as a sum of consecutive naturals, for example, 31540782 + ... + 31540807.

It is an arithmetic number, because the mean of its divisors is an integer number (220785565).

Almost surely, 2^820060657 is an apocalyptic number.

It is an amenable number.

820060657 is a deficient number, since it is larger than the sum of its proper divisors (63081603).

820060657 is a wasteful number, since it uses less digits than its factorization.

820060657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63081602.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 820060657 is about 28636.7012241285. The cubic root of 820060657 is about 936.0132407513.

The spelling of 820060657 in words is "eight hundred twenty million, sixty thousand, six hundred fifty-seven".