685366452 has 18 divisors (see below), whose sum is σ = 1732454178. Its totient is φ = 228455472.

The previous prime is 685366439. The next prime is 685366457. The reversal of 685366452 is 254663586.

685366452 is a `hidden beast` number, since 6 + 8 + 536 + 64 + 52 = 666.

It can be written as a sum of positive squares in only one way, i.e., 630813456 + 54552996 = 25116^2 + 7386^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 685366398 and 685366407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685366457) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9518943 + ... + 9519014.

Almost surely, 2^685366452 is an apocalyptic number.

It is an amenable number.

685366452 is an abundant number, since it is smaller than the sum of its proper divisors (1047087726).

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

685366452 is a wasteful number, since it uses less digits than its factorization.

685366452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19037967 (or 19037962 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The square root of 685366452 is about 26179.5044261728. The cubic root of 685366452 is about 881.6731477438.

The spelling of 685366452 in words is "six hundred eighty-five million, three hundred sixty-six thousand, four hundred fifty-two".