685138176 has 360 divisors, whose sum is σ = 2255594880. Its totient is φ = 206032896.

The previous prime is 685138169. The next prime is 685138183. The reversal of 685138176 is 671831586.

685138176 is a `hidden beast` number, since 68 + 513 + 8 + 1 + 76 = 666.

It is an interprime number because it is at equal distance from previous prime (685138169) and next prime (685138183).

Its product of digits (241920) is a multiple of the sum of its prime divisors (108).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14577385 + ... + 14577431.

Almost surely, 2^685138176 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 685138176, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1127797440).

685138176 is an abundant number, since it is smaller than the sum of its proper divisors (1570456704).

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

685138176 is a wasteful number, since it uses less digits than its factorization.

685138176 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131 (or 108 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 685138176 is about 26175.1442402903. The cubic root of 685138176 is about 881.5752501553.

The spelling of 685138176 in words is "six hundred eighty-five million, one hundred thirty-eight thousand, one hundred seventy-six".