623680 has 28 divisors (see below), whose sum is σ = 1485900. Its totient is φ = 249344.

The previous prime is 623677. The next prime is 623681. The reversal of 623680 is 86326.

It can be written as a sum of positive squares in 2 ways, for example, as 369664 + 254016 = 608^2 + 504^2 .

It is an Ulam number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (623681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655 + ... + 1294.

2⁶²³⁶⁸⁰ is an apocalyptic number.

It is an amenable number.

623680 is an abundant number, since it is smaller than the sum of its proper divisors (862220).

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

623680 is a wasteful number, since it uses less digits than its factorization.

623680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966 (or 1956 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 623680 is about 789.7341324775. The cubic root of 623680 is about 85.4385637562.

The spelling of 623680 in words is "six hundred twenty-three thousand, six hundred eighty".