857922660 has 288 divisors, whose sum is σ = 3141815040. Its totient is φ = 185342976.

The previous prime is 857922649. The next prime is 857922661. The reversal of 857922660 is 66229758.

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

It is not an unprimeable number, because it can be changed into a prime (857922661) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1936399 + ... + 1936841.

It is an arithmetic number, because the mean of its divisors is an integer number (10909080).

Almost surely, 2^857922660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857922660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1570907520).

857922660 is an abundant number, since it is smaller than the sum of its proper divisors (2283892380).

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

857922660 is a wasteful number, since it uses less digits than its factorization.

857922660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547 (or 542 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 857922660 is about 29290.3168299696. The cubic root of 857922660 is about 950.2022321082.

The spelling of 857922660 in words is "eight hundred fifty-seven million, nine hundred twenty-two thousand, six hundred sixty".