857288080 has 80 divisors (see below), whose sum is σ = 2205180288. Its totient is φ = 307328000.

The previous prime is 857288071. The next prime is 857288099. The reversal of 857288080 is 80882758.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×857288080² = 1469885704220172800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 857288080.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55620 + ... + 69340.

Almost surely, 2^857288080 is an apocalyptic number.

857288080 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 857288080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1102590144).

857288080 is an abundant number, since it is smaller than the sum of its proper divisors (1347892208).

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

857288080 is a wasteful number, since it uses less digits than its factorization.

857288080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13816 (or 13810 counting only the distinct ones).

The product of its (nonzero) digits is 286720, while the sum is 46.

The square root of 857288080 is about 29279.4822358593. The cubic root of 857288080 is about 949.9678954986.

The spelling of 857288080 in words is "eight hundred fifty-seven million, two hundred eighty-eight thousand, eighty".