857423520 has 144 divisors (see below), whose sum is σ = 2933952840. Its totient is φ = 228022272.

The previous prime is 857423473. The next prime is 857423557. The reversal of 857423520 is 25324758.

857423520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 482768784 + 374654736 = 21972^2 + 19356^2 .

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 801546 + ... + 802614.

Almost surely, 2^857423520 is an apocalyptic number.

857423520 is a gapful number since it is divisible by the number (80) 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 857423520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1466976420).

857423520 is an abundant number, since it is smaller than the sum of its proper divisors (2076529320).

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

857423520 is a wasteful number, since it uses less digits than its factorization.

857423520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647 (or 1636 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

The square root of 857423520 is about 29281.7950269446. The cubic root of 857423520 is about 950.0179202529.

The spelling of 857423520 in words is "eight hundred fifty-seven million, four hundred twenty-three thousand, five hundred twenty".