857320432 has 40 divisors (see below), whose sum is σ = 1752546560. Its totient is φ = 405155520.

The previous prime is 857320393. The next prime is 857320433. The reversal of 857320432 is 234023758.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857320433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137707 + ... + 143797.

It is an arithmetic number, because the mean of its divisors is an integer number (43813664).

Almost surely, 2^857320432 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 857320432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (876273280).

857320432 is an abundant number, since it is smaller than the sum of its proper divisors (895226128).

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

857320432 is a wasteful number, since it uses less digits than its factorization.

857320432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6581 (or 6575 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 857320432 is about 29280.0346994330. The cubic root of 857320432 is about 949.9798451864.

The spelling of 857320432 in words is "eight hundred fifty-seven million, three hundred twenty thousand, four hundred thirty-two".