857680240 has 20 divisors (see below), whose sum is σ = 1994106744. Its totient is φ = 343072064.

The previous prime is 857680237. The next prime is 857680253. The reversal of 857680240 is 42086758.

857680240 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 (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 857680193 and 857680202.

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, 5360422 + ... + 5360581.

Almost surely, 2^857680240 is an apocalyptic number.

857680240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

857680240 is an abundant number, since it is smaller than the sum of its proper divisors (1136426504).

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

857680240 is a wasteful number, since it uses less digits than its factorization.

857680240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10721016 (or 10721010 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 857680240 is about 29286.1783099127. The cubic root of 857680240 is about 950.1127253125.

The spelling of 857680240 in words is "eight hundred fifty-seven million, six hundred eighty thousand, two hundred forty".