685761438 has 16 divisors (see below), whose sum is σ = 1388048256. Its totient is φ = 225832920.

The previous prime is 685761409. The next prime is 685761467. The reversal of 685761438 is 834167586.

It is an interprime number because it is at equal distance from previous prime (685761409) and next prime (685761467).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 688018 + ... + 689013.

It is an arithmetic number, because the mean of its divisors is an integer number (86753016).

Almost surely, 2^685761438 is an apocalyptic number.

685761438 is an abundant number, since it is smaller than the sum of its proper divisors (702286818).

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

685761438 is a wasteful number, since it uses less digits than its factorization.

685761438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377119.

The product of its digits is 967680, while the sum is 48.

The square root of 685761438 is about 26187.0471416691. The cubic root of 685761438 is about 881.8424886223.

The spelling of 685761438 in words is "six hundred eighty-five million, seven hundred sixty-one thousand, four hundred thirty-eight".