856673280 has 176 divisors, whose sum is σ = 3044953440. Its totient is φ = 228409344.

The previous prime is 856673269. The next prime is 856673281. The reversal of 856673280 is 82376658.

856673280 is a `hidden beast` number, since 8 + 566 + 7 + 3 + 2 + 80 = 666.

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

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (856673281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135142 + ... + 141338.

Almost surely, 2^856673280 is an apocalyptic number.

856673280 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 856673280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1522476720).

856673280 is an abundant number, since it is smaller than the sum of its proper divisors (2188280160).

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

856673280 is a wasteful number, since it uses less digits than its factorization.

856673280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6231 (or 6207 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 856673280 is about 29268.9815333571. The cubic root of 856673280 is about 949.7407528981.

The spelling of 856673280 in words is "eight hundred fifty-six million, six hundred seventy-three thousand, two hundred eighty".