857578417940 has 12 divisors (see below), whose sum is σ = 1800914677716. Its totient is φ = 343031367168.

The previous prime is 857578417903. The next prime is 857578417991. The reversal of 857578417940 is 49714875758.

857578417940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 137934988816 + 719643429124 = 371396^2 + 848318^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21439460429 + ... + 21439460468.

It is an arithmetic number, because the mean of its divisors is an integer number (150076223143).

Almost surely, 2^857578417940 is an apocalyptic number.

It is an amenable number.

857578417940 is an abundant number, since it is smaller than the sum of its proper divisors (943336259776).

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

857578417940 is a wasteful number, since it uses less digits than its factorization.

857578417940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42878920906 (or 42878920904 counting only the distinct ones).

The product of its (nonzero) digits is 79027200, while the sum is 65.

The spelling of 857578417940 in words is "eight hundred fifty-seven billion, five hundred seventy-eight million, four hundred seventeen thousand, nine hundred forty".