685379772 has 192 divisors, whose sum is σ = 2247705600. Its totient is φ = 175426560.

The previous prime is 685379771. The next prime is 685379797. The reversal of 685379772 is 277973586.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685379771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 606504 + ... + 607632.

It is an arithmetic number, because the mean of its divisors is an integer number (11706800).

Almost surely, 2^685379772 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 685379772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1123852800).

685379772 is an abundant number, since it is smaller than the sum of its proper divisors (1562325828).

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

685379772 is a wasteful number, since it uses less digits than its factorization.

685379772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233 (or 1225 counting only the distinct ones).

The product of its digits is 4445280, while the sum is 54.

The square root of 685379772 is about 26179.7588224185. The cubic root of 685379772 is about 881.6788594378.

It can be divided in two parts, 6 and 85379772, that added together give a triangular number (85379778 = T₁₃₀₆₇).

The spelling of 685379772 in words is "six hundred eighty-five million, three hundred seventy-nine thousand, seven hundred seventy-two".