2857278381 has 4 divisors (see below), whose sum is σ = 3809704512. Its totient is φ = 1904852252.

The previous prime is 2857278353. The next prime is 2857278409. The reversal of 2857278381 is 1838727582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2857278353) and next prime (2857278409).

It is a cyclic number.

It is not a de Polignac number, because 2857278381 - 2⁷ = 2857278253 is a prime.

It is a super-2 number, since 2×2857278381² = 16328079493059962322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2857278341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 476213061 + ... + 476213066.

It is an arithmetic number, because the mean of its divisors is an integer number (952426128).

Almost surely, 2^2857278381 is an apocalyptic number.

It is an amenable number.

2857278381 is a deficient number, since it is larger than the sum of its proper divisors (952426131).

2857278381 is an equidigital number, since it uses as much as digits as its factorization.

2857278381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952426130.

The product of its digits is 1505280, while the sum is 51.

The square root of 2857278381 is about 53453.5160770552. The cubic root of 2857278381 is about 1419.0058473279.

It can be divided in two parts, 28572 and 78381, that added together give a triangular number (106953 = T₄₆₂).

The spelling of 2857278381 in words is "two billion, eight hundred fifty-seven million, two hundred seventy-eight thousand, three hundred eighty-one".