686475630720 has 768 divisors, whose sum is σ = 2682356342400. Its totient is φ = 165798420480.

The previous prime is 686475630697. The next prime is 686475630721. The reversal of 686475630720 is 27036574686.

686475630720 is a `hidden beast` number, since 6 + 8 + 6 + 4 + 7 + 563 + 0 + 72 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (686475630721) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 830078947 + ... + 830079773.

Almost surely, 2^686475630720 is an apocalyptic number.

686475630720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686475630720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1341178171200).

686475630720 is an abundant number, since it is smaller than the sum of its proper divisors (1995880711680).

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

686475630720 is a wasteful number, since it uses less digits than its factorization.

686475630720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274 (or 1245 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 54.

The spelling of 686475630720 in words is "six hundred eighty-six billion, four hundred seventy-five million, six hundred thirty thousand, seven hundred twenty".