857640750 has 64 divisors (see below), whose sum is σ = 2145559104. Its totient is φ = 228182400.

The previous prime is 857640673. The next prime is 857640811. The reversal of 857640750 is 57046758.

It is a Curzon number.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 416724 + ... + 418776.

It is an arithmetic number, because the mean of its divisors is an integer number (33524361).

Almost surely, 2^857640750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857640750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1072779552).

857640750 is an abundant number, since it is smaller than the sum of its proper divisors (1287918354).

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

857640750 is a wasteful number, since it uses less digits than its factorization.

857640750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2630 (or 2620 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 42.

The square root of 857640750 is about 29285.5040933223. The cubic root of 857640750 is about 950.0981431386.

The spelling of 857640750 in words is "eight hundred fifty-seven million, six hundred forty thousand, seven hundred fifty".