685134720 has 256 divisors, whose sum is σ = 2506752000. Its totient is φ = 176670720.

The previous prime is 685134683. The next prime is 685134721. The reversal of 685134720 is 27431586.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685134721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 535041 + ... + 536319.

It is an arithmetic number, because the mean of its divisors is an integer number (9792000).

Almost surely, 2^685134720 is an apocalyptic number.

685134720 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 685134720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1253376000).

685134720 is an abundant number, since it is smaller than the sum of its proper divisors (1821617280).

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

685134720 is a wasteful number, since it uses less digits than its factorization.

685134720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338 (or 1320 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 685134720 is about 26175.0782233788. The cubic root of 685134720 is about 881.5737678610.

The spelling of 685134720 in words is "six hundred eighty-five million, one hundred thirty-four thousand, seven hundred twenty".