857666880 has 560 divisors, whose sum is σ = 3629070720. Its totient is φ = 188116992.

The previous prime is 857666861. The next prime is 857666891. The reversal of 857666880 is 88666758.

857666880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (560).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 5261679 + ... + 5261841.

Almost surely, 2^857666880 is an apocalyptic number.

857666880 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 857666880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1814535360).

857666880 is an abundant number, since it is smaller than the sum of its proper divisors (2771403840).

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

857666880 is a wasteful number, since it uses less digits than its factorization.

857666880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The square root of 857666880 is about 29285.9502150775. The cubic root of 857666880 is about 950.1077920163.

The spelling of 857666880 in words is "eight hundred fifty-seven million, six hundred sixty-six thousand, eight hundred eighty".