857720279808 has 432 divisors, whose sum is σ = 2913734591040. Its totient is φ = 237533036544.

The previous prime is 857720279737. The next prime is 857720279849. The reversal of 857720279808 is 808972027758.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 165293278 + ... + 165298466.

Almost surely, 2^857720279808 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 857720279808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1456867295520).

857720279808 is an abundant number, since it is smaller than the sum of its proper divisors (2056014311232).

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

857720279808 is a wasteful number, since it uses less digits than its factorization.

857720279808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5532 (or 5515 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 63.

The spelling of 857720279808 in words is "eight hundred fifty-seven billion, seven hundred twenty million, two hundred seventy-nine thousand, eight hundred eight".