685377 has 48 divisors (see below), whose sum is σ = 1317888. Its totient is φ = 332640.

The previous prime is 685369. The next prime is 685381. The reversal of 685377 is 773586.

It is not a de Polignac number, because 685377 - 2³ = 685369 is a prime.

It is an Ulam number.

Its product of digits (35280) is a multiple of the sum of its prime factors (90).

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685337) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15918 + ... + 15960.

It is an arithmetic number, because the mean of its divisors is an integer number (27456).

2⁶⁸⁵³⁷⁷ is an apocalyptic number.

It is an amenable number.

685377 is a deficient number, since it is larger than the sum of its proper divisors (632511).

685377 is a wasteful number, since it uses less digits than its factorization.

685377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 87 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 685377 is about 827.8749905632. The cubic root of 685377 is about 88.1677670794.

Subtracting 685377 from its reverse (773586), we obtain a square (88209 = 297²).

It can be divided in two parts, 68 and 5377, that added together give a palindrome (5445).

The spelling of 685377 in words is "six hundred eighty-five thousand, three hundred seventy-seven".