2857380981 has 32 divisors (see below), whose sum is σ = 4815783168. Its totient is φ = 1466449920.

The previous prime is 2857380973. The next prime is 2857380983. The reversal of 2857380981 is 1890837582.

It is not a de Polignac number, because 2857380981 - 2³ = 2857380973 is a prime.

It is a super-2 number, since 2×2857380981² = 16329252141161044722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2857380983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131340 + ... + 151541.

It is an arithmetic number, because the mean of its divisors is an integer number (150493224).

Almost surely, 2^2857380981 is an apocalyptic number.

2857380981 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2857380981 is a deficient number, since it is larger than the sum of its proper divisors (1958402187).

2857380981 is a wasteful number, since it uses less digits than its factorization.

2857380981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282941.

The product of its (nonzero) digits is 967680, while the sum is 51.

The square root of 2857380981 is about 53454.4757807987. The cubic root of 2857380981 is about 1419.0228318190.

The spelling of 2857380981 in words is "two billion, eight hundred fifty-seven million, three hundred eighty thousand, nine hundred eighty-one".