680402 has 4 divisors (see below), whose sum is σ = 1020606. Its totient is φ = 340200.

The previous prime is 680401. The next prime is 680411. The reversal of 680402 is 204086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204086 = 2 ⋅102043.

It can be written as a sum of positive squares in only one way, i.e., 654481 + 25921 = 809^2 + 161^2 .

It is not an unprimeable number, because it can be changed into a prime (680401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170099 + ... + 170102.

2⁶⁸⁰⁴⁰² is an apocalyptic number.

680402 is a deficient number, since it is larger than the sum of its proper divisors (340204).

680402 is a wasteful number, since it uses less digits than its factorization.

680402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340203.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 680402 is about 824.8648374128. The cubic root of 680402 is about 87.9539187112.

Adding to 680402 its reverse (204086), we get a palindrome (884488).

It can be divided in two parts, 6 and 80402, that added together give a palindrome (80408).

The spelling of 680402 in words is "six hundred eighty thousand, four hundred two".