856553670 has 256 divisors, whose sum is σ = 2821754880. Its totient is φ = 180430848.

The previous prime is 856553669. The next prime is 856553683. The reversal of 856553670 is 76355658.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1702639 + ... + 1703141.

It is an arithmetic number, because the mean of its divisors is an integer number (11022480).

Almost surely, 2^856553670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856553670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1410877440).

856553670 is an abundant number, since it is smaller than the sum of its proper divisors (1965201210).

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

856553670 is a wasteful number, since it uses less digits than its factorization.

856553670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596 (or 590 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 45.

The square root of 856553670 is about 29266.9381726207. The cubic root of 856553670 is about 949.6965494344.

The spelling of 856553670 in words is "eight hundred fifty-six million, five hundred fifty-three thousand, six hundred seventy".