857213720 has 64 divisors (see below), whose sum is σ = 2117642400. Its totient is φ = 309703680.

The previous prime is 857213719. The next prime is 857213723. The reversal of 857213720 is 27312758.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857213723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62876 + ... + 75284.

Almost surely, 2^857213720 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 857213720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1058821200).

857213720 is an abundant number, since it is smaller than the sum of its proper divisors (1260428680).

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

857213720 is a wasteful number, since it uses less digits than its factorization.

857213720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12588 (or 12584 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 857213720 is about 29278.2123771244. The cubic root of 857213720 is about 949.9404283975.

The spelling of 857213720 in words is "eight hundred fifty-seven million, two hundred thirteen thousand, seven hundred twenty".