685281623 has 16 divisors (see below), whose sum is σ = 747959520. Its totient is φ = 624070656.

The previous prime is 685281589. The next prime is 685281643. The reversal of 685281623 is 326182586.

It is a cyclic number.

It is not a de Polignac number, because 685281623 - 2⁸ = 685281367 is a prime.

It is a super-2 number, since 2×685281623² = 939221805643028258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685281643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 527711 + ... + 529007.

It is an arithmetic number, because the mean of its divisors is an integer number (46747470).

Almost surely, 2^685281623 is an apocalyptic number.

685281623 is a deficient number, since it is larger than the sum of its proper divisors (62677897).

685281623 is a wasteful number, since it uses less digits than its factorization.

685281623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826.

The product of its digits is 138240, while the sum is 41.

The square root of 685281623 is about 26177.8842345977. The cubic root of 685281623 is about 881.6367708357.

The spelling of 685281623 in words is "six hundred eighty-five million, two hundred eighty-one thousand, six hundred twenty-three".