697657 has 4 divisors (see below), whose sum is σ = 709156. Its totient is φ = 686160.

The previous prime is 697643. The next prime is 697673. The reversal of 697657 is 756796.

697657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 95481 + 602176 = 309^2 + 776^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697657 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (697637) 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, 5658 + ... + 5779.

It is an arithmetic number, because the mean of its divisors is an integer number (177289).

2⁶⁹⁷⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

697657 is a deficient number, since it is larger than the sum of its proper divisors (11499).

697657 is a wasteful number, since it uses less digits than its factorization.

697657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11498.

The product of its digits is 79380, while the sum is 40.

The square root of 697657 is about 835.2586425773. The cubic root of 697657 is about 88.6912247224.

The spelling of 697657 in words is "six hundred ninety-seven thousand, six hundred fifty-seven".