680490 has 24 divisors (see below), whose sum is σ = 1769508. Its totient is φ = 181440.

The previous prime is 680489. The next prime is 680503. The reversal of 680490 is 94086.

It can be written as a sum of positive squares in 2 ways, for example, as 651249 + 29241 = 807^2 + 171^2 .

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3691 + ... + 3870.

2⁶⁸⁰⁴⁹⁰ is an apocalyptic number.

680490 is an abundant number, since it is smaller than the sum of its proper divisors (1089018).

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

680490 is a wasteful number, since it uses less digits than its factorization.

680490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7574 (or 7571 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 680490 is about 824.9181777607. The cubic root of 680490 is about 87.9577103967.

The spelling of 680490 in words is "six hundred eighty thousand, four hundred ninety".