685047621888 has 432 divisors, whose sum is σ = 2385738976320. Its totient is φ = 195720053760.

The previous prime is 685047621883. The next prime is 685047621889. The reversal of 685047621888 is 888126740586.

685047621888 is a `hidden beast` number, since 6 + 85 + 0 + 476 + 2 + 1 + 8 + 88 = 666.

It is a tau number, because it is divible by the number of its divisors (432).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (685047621883) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27421243 + ... + 27446213.

Almost surely, 2^685047621888 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 685047621888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1192869488160).

685047621888 is an abundant number, since it is smaller than the sum of its proper divisors (1700691354432).

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

685047621888 is an frugal number, since it uses more digits than its factorization.

685047621888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25022 (or 24983 counting only the distinct ones).

The product of its (nonzero) digits is 41287680, while the sum is 63.

The spelling of 685047621888 in words is "six hundred eighty-five billion, forty-seven million, six hundred twenty-one thousand, eight hundred eighty-eight".