852821640 has 96 divisors (see below), whose sum is σ = 3023654400. Its totient is φ = 206743680.

The previous prime is 852821633. The next prime is 852821653. The reversal of 852821640 is 46128258.

852821640 is a `hidden beast` number, since 8 + 5 + 2 + 8 + 2 + 1 + 640 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 852821595 and 852821604.

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, 103720 + ... + 111639.

It is an arithmetic number, because the mean of its divisors is an integer number (31496400).

Almost surely, 2^852821640 is an apocalyptic number.

It is an amenable number.

852821640 is an abundant number, since it is smaller than the sum of its proper divisors (2170832760).

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

852821640 is a wasteful number, since it uses less digits than its factorization.

852821640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215387 (or 215380 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 852821640 is about 29203.1101083429. The cubic root of 852821640 is about 948.3152559367.

Adding to 852821640 its reverse (46128258), we get a palindrome (898949898).

The spelling of 852821640 in words is "eight hundred fifty-two million, eight hundred twenty-one thousand, six hundred forty".