857647540 has 24 divisors (see below), whose sum is σ = 1839382272. Its totient is φ = 335759520.

The previous prime is 857647523. The next prime is 857647547. The reversal of 857647540 is 45746758.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857647547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455256 + ... + 457135.

It is an arithmetic number, because the mean of its divisors is an integer number (76640928).

Almost surely, 2^857647540 is an apocalyptic number.

It is an amenable number.

857647540 is an abundant number, since it is smaller than the sum of its proper divisors (981734732).

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

857647540 is a wasteful number, since it uses less digits than its factorization.

857647540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912447 (or 912445 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 46.

The square root of 857647540 is about 29285.6200207542. The cubic root of 857647540 is about 950.1006504624.

The spelling of 857647540 in words is "eight hundred fifty-seven million, six hundred forty-seven thousand, five hundred forty".