685508652 has 72 divisors (see below), whose sum is σ = 1812754944. Its totient is φ = 218012256.

The previous prime is 685508651. The next prime is 685508653. The reversal of 685508652 is 256805586.

685508652 is a `hidden beast` number, since 6 + 85 + 508 + 65 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (685508651) and next prime (685508653).

It is a super-2 number, since 2×685508652² = 939844223933714208, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 685508598 and 685508607.

It is not an unprimeable number, because it can be changed into a prime (685508651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 432253 + ... + 433835.

It is an arithmetic number, because the mean of its divisors is an integer number (25177152).

Almost surely, 2^685508652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685508652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (906377472).

685508652 is an abundant number, since it is smaller than the sum of its proper divisors (1127246292).

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

685508652 is a wasteful number, since it uses less digits than its factorization.

685508652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139 (or 2134 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The square root of 685508652 is about 26182.2201503234. The cubic root of 685508652 is about 881.7341201143.

The spelling of 685508652 in words is "six hundred eighty-five million, five hundred eight thousand, six hundred fifty-two".