853622640 has 120 divisors (see below), whose sum is σ = 3087302400. Its totient is φ = 210120192.

The previous prime is 853622617. The next prime is 853622647. The reversal of 853622640 is 46226358.

853622640 is a `hidden beast` number, since 8 + 5 + 3 + 6 + 2 + 2 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×853622640² = 1457343223041139200, which contains 22 as substring.

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 = 853622595 and 853622604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853622647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36240 + ... + 54959.

It is an arithmetic number, because the mean of its divisors is an integer number (25727520).

Almost surely, 2^853622640 is an apocalyptic number.

853622640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

853622640 is an abundant number, since it is smaller than the sum of its proper divisors (2233679760).

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

853622640 is a wasteful number, since it uses less digits than its factorization.

853622640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91231 (or 91222 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 853622640 is about 29216.8211823258. The cubic root of 853622640 is about 948.6120600178.

Adding to 853622640 its reverse (46226358), we get a palindrome (899848998).

The spelling of 853622640 in words is "eight hundred fifty-three million, six hundred twenty-two thousand, six hundred forty".