857728370 has 16 divisors (see below), whose sum is σ = 1634729688. Its totient is φ = 322909440.

The previous prime is 857728363. The next prime is 857728379. The reversal of 857728370 is 73827758.

It is a happy number.

It is a Cunningham number, because it is equal to 29287²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 667757281 + 189971089 = 25841^2 + 13783^2 .

It is not an unprimeable number, because it can be changed into a prime (857728379) 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, 2522561 + ... + 2522900.

Almost surely, 2^857728370 is an apocalyptic number.

857728370 is a deficient number, since it is larger than the sum of its proper divisors (777001318).

857728370 is a wasteful number, since it uses less digits than its factorization.

857728370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5045485.

The product of its (nonzero) digits is 658560, while the sum is 47.

The square root of 857728370 is about 29287.0000170724. Note that the first 4 decimals coincide. The cubic root of 857728370 is about 950.1304973088.

The spelling of 857728370 in words is "eight hundred fifty-seven million, seven hundred twenty-eight thousand, three hundred seventy".