1685650572 has 72 divisors (see below), whose sum is σ = 4538884896. Its totient is φ = 525633024.

The previous prime is 1685650567. The next prime is 1685650573. The reversal of 1685650572 is 2750565861.

1685650572 is a `hidden beast` number, since 16 + 8 + 5 + 65 + 0 + 572 = 666.

It is not an unprimeable number, because it can be changed into a prime (1685650573) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 93958 + ... + 110450.

It is an arithmetic number, because the mean of its divisors is an integer number (63040068).

Almost surely, 2^1685650572 is an apocalyptic number.

1685650572 is a gapful number since it is divisible by the number (12) 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 1685650572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2269442448).

1685650572 is an abundant number, since it is smaller than the sum of its proper divisors (2853234324).

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

1685650572 is a wasteful number, since it uses less digits than its factorization.

1685650572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16687 (or 16682 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The square root of 1685650572 is about 41056.6751211055. The cubic root of 1685650572 is about 1190.1156990348.

The spelling of 1685650572 in words is "one billion, six hundred eighty-five million, six hundred fifty thousand, five hundred seventy-two".