1428559857 has 24 divisors (see below), whose sum is σ = 2090980008. Its totient is φ = 939744000.

The previous prime is 1428559841. The next prime is 1428559871. The reversal of 1428559857 is 7589558241.

1428559857 is a `hidden beast` number, since 1 + 4 + 2 + 8 + 559 + 85 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 415792881 + 1012766976 = 20391^2 + 31824^2 .

It is not a de Polignac number, because 1428559857 - 2⁴ = 1428559841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1428559817) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 282007 + ... + 287027.

It is an arithmetic number, because the mean of its divisors is an integer number (87124167).

Almost surely, 2^1428559857 is an apocalyptic number.

It is an amenable number.

1428559857 is a deficient number, since it is larger than the sum of its proper divisors (662420151).

1428559857 is a wasteful number, since it uses less digits than its factorization.

1428559857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5441 (or 5438 counting only the distinct ones).

The product of its digits is 4032000, while the sum is 54.

The square root of 1428559857 is about 37796.2942231113. The cubic root of 1428559857 is about 1126.2448395286.

The spelling of 1428559857 in words is "one billion, four hundred twenty-eight million, five hundred fifty-nine thousand, eight hundred fifty-seven".