2857138508 has 24 divisors (see below), whose sum is σ = 5722585344. Its totient is φ = 1222707600.

The previous prime is 2857138463. The next prime is 2857138511. The reversal of 2857138508 is 8058317582.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54488 + ... + 93183.

It is an arithmetic number, because the mean of its divisors is an integer number (238441056).

Almost surely, 2^2857138508 is an apocalyptic number.

2857138508 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2857138508 is an abundant number, since it is smaller than the sum of its proper divisors (2865446836).

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

2857138508 is a wasteful number, since it uses less digits than its factorization.

2857138508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148373 (or 148371 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 47.

The square root of 2857138508 is about 53452.2076999632. The cubic root of 2857138508 is about 1418.9826919778.

The spelling of 2857138508 in words is "two billion, eight hundred fifty-seven million, one hundred thirty-eight thousand, five hundred eight".