686229949440 has 1056 divisors, whose sum is σ = 2931314480640. Its totient is φ = 144919756800.

The previous prime is 686229949403. The next prime is 686229949463. The reversal of 686229949440 is 44949922686.

686229949440 is a `hidden beast` number, since 6 + 8 + 62 + 2 + 99 + 49 + 440 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 251272875 + ... + 251275605.

Almost surely, 2^686229949440 is an apocalyptic number.

686229949440 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 686229949440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1465657240320).

686229949440 is an abundant number, since it is smaller than the sum of its proper divisors (2245084531200).

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

686229949440 is a wasteful number, since it uses less digits than its factorization.

686229949440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829 (or 2808 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 63.

The spelling of 686229949440 in words is "six hundred eighty-six billion, two hundred twenty-nine million, nine hundred forty-nine thousand, four hundred forty".