697640 has 32 divisors (see below), whose sum is σ = 1594080. Its totient is φ = 274752.

The previous prime is 697637. The next prime is 697643. The reversal of 697640 is 46796.

It is an interprime number because it is at equal distance from previous prime (697637) and next prime (697643).

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 697597 and 697606.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 697640.

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 7 ways as a sum of consecutive naturals, for example, 4199 + ... + 4361.

It is an arithmetic number, because the mean of its divisors is an integer number (49815).

2⁶⁹⁷⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

697640 is an abundant number, since it is smaller than the sum of its proper divisors (896440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

697640 is a wasteful number, since it uses less digits than its factorization.

697640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 697640 is about 835.2484660267. The cubic root of 697640 is about 88.6905043288.

The spelling of 697640 in words is "six hundred ninety-seven thousand, six hundred forty".