680392 has 8 divisors (see below), whose sum is σ = 1275750. Its totient is φ = 340192.

The previous prime is 680387. The next prime is 680399. The reversal of 680392 is 293086.

It can be written as a sum of positive squares in only one way, i.e., 586756 + 93636 = 766^2 + 306^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 680392.

It is not an unprimeable number, because it can be changed into a prime (680399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42517 + ... + 42532.

2⁶⁸⁰³⁹² is an apocalyptic number.

It is an amenable number.

680392 is a deficient number, since it is larger than the sum of its proper divisors (595358).

680392 is a wasteful number, since it uses less digits than its factorization.

680392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85055 (or 85051 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 680392 is about 824.8587757913. The cubic root of 680392 is about 87.9534878171.

The spelling of 680392 in words is "six hundred eighty thousand, three hundred ninety-two".