857136420 has 144 divisors (see below), whose sum is σ = 3032265600. Its totient is φ = 195902784.

The previous prime is 857136407. The next prime is 857136421. The reversal of 857136420 is 24631758.

857136420 is a `hidden beast` number, since 8 + 5 + 7 + 1 + 3 + 642 + 0 = 666.

857136420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (857136421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54799 + ... + 68681.

It is an arithmetic number, because the mean of its divisors is an integer number (21057400).

Almost surely, 2^857136420 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 857136420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1516132800).

857136420 is an abundant number, since it is smaller than the sum of its proper divisors (2175129180).

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

857136420 is a wasteful number, since it uses less digits than its factorization.

857136420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13919 (or 13900 counting only the distinct ones).

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

The square root of 857136420 is about 29276.8922531064. The cubic root of 857136420 is about 949.9118736350.

The spelling of 857136420 in words is "eight hundred fifty-seven million, one hundred thirty-six thousand, four hundred twenty".