857491712 has 144 divisors (see below), whose sum is σ = 2188093824. Its totient is φ = 325632000.

The previous prime is 857491711. The next prime is 857491741. The reversal of 857491712 is 217194758.

It is a super-2 number, since 2×857491712² = 1470584072297381888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857491711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 807662 + ... + 808722.

It is an arithmetic number, because the mean of its divisors is an integer number (15195096).

Almost surely, 2^857491712 is an apocalyptic number.

857491712 is a gapful number since it is divisible by the number (82) 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 857491712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1094046912).

857491712 is an abundant number, since it is smaller than the sum of its proper divisors (1330602112).

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

857491712 is a wasteful number, since it uses less digits than its factorization.

857491712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136 (or 1122 counting only the distinct ones).

The product of its digits is 141120, while the sum is 44.

The square root of 857491712 is about 29282.9594132834. The cubic root of 857491712 is about 950.0431049693.

The spelling of 857491712 in words is "eight hundred fifty-seven million, four hundred ninety-one thousand, seven hundred twelve".