856389760 has 32 divisors (see below), whose sum is σ = 2047308300. Its totient is φ = 342555648.

The previous prime is 856389733. The next prime is 856389761. The reversal of 856389760 is 67983658.

It can be written as a sum of positive squares in 2 ways, for example, as 825297984 + 31091776 = 28728^2 + 5576^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 856389698 and 856389707.

It is not an unprimeable number, because it can be changed into a prime (856389761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 668415 + ... + 669694.

Almost surely, 2^856389760 is an apocalyptic number.

856389760 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

856389760 is an abundant number, since it is smaller than the sum of its proper divisors (1190918540).

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

856389760 is a wasteful number, since it uses less digits than its factorization.

856389760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338128 (or 1338116 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 856389760 is about 29264.1377798834. The cubic root of 856389760 is about 949.6359676334.

The spelling of 856389760 in words is "eight hundred fifty-six million, three hundred eighty-nine thousand, seven hundred sixty".