685638272592 has 1200 divisors, whose sum is σ = 2608431716352. Its totient is φ = 172127047680.

The previous prime is 685638272573. The next prime is 685638272597. The reversal of 685638272592 is 295272836586.

685638272592 is a `hidden beast` number, since 6 + 8 + 5 + 6 + 38 + 2 + 7 + 2 + 592 = 666.

685638272592 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685638272597) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 1868223993 + ... + 1868224359.

Almost surely, 2^685638272592 is an apocalyptic number.

685638272592 is a gapful number since it is divisible by the number (62) 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 685638272592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1304215858176).

685638272592 is an abundant number, since it is smaller than the sum of its proper divisors (1922793443760).

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

685638272592 is a wasteful number, since it uses less digits than its factorization.

685638272592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 496 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 63.

The spelling of 685638272592 in words is "six hundred eighty-five billion, six hundred thirty-eight million, two hundred seventy-two thousand, five hundred ninety-two".