855008640 has 96 divisors (see below), whose sum is σ = 2952471600. Its totient is φ = 228000768.

The previous prime is 855008611. The next prime is 855008701. The reversal of 855008640 is 46800558.

It is a happy number.

855008640 is a `hidden beast` number, since 8 + 5 + 5 + 0 + 0 + 8 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

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 = 855008595 and 855008604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68460 + ... + 79979.

Almost surely, 2^855008640 is an apocalyptic number.

855008640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

855008640 is an abundant number, since it is smaller than the sum of its proper divisors (2097462960).

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

855008640 is a wasteful number, since it uses less digits than its factorization.

855008640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148464 (or 148449 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 855008640 is about 29240.5307749364. The cubic root of 855008640 is about 949.1251928347.

The spelling of 855008640 in words is "eight hundred fifty-five million, eight thousand, six hundred forty".