697649 has 4 divisors (see below), whose sum is σ = 706560. Its totient is φ = 688740.

The previous prime is 697643. The next prime is 697673. The reversal of 697649 is 946796.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-697649 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 697649.

It is not an unprimeable number, because it can be changed into a prime (697643) 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, 4337 + ... + 4494.

It is an arithmetic number, because the mean of its divisors is an integer number (176640).

2⁶⁹⁷⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

697649 is a deficient number, since it is larger than the sum of its proper divisors (8911).

697649 is an equidigital number, since it uses as much as digits as its factorization.

697649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8910.

The product of its digits is 81648, while the sum is 41.

The square root of 697649 is about 835.2538536277. The cubic root of 697649 is about 88.6908857151.

The spelling of 697649 in words is "six hundred ninety-seven thousand, six hundred forty-nine".