2857778157 has 24 divisors (see below), whose sum is σ = 4144302624. Its totient is φ = 1741306464.

The previous prime is 2857778123. The next prime is 2857778191. The reversal of 2857778157 is 7518777582.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2857778123) and next prime (2857778191).

It is not a de Polignac number, because 2857778157 - 2⁷ = 2857778029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2857778097 and 2857778106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2857778057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 410298 + ... + 417204.

It is an arithmetic number, because the mean of its divisors is an integer number (172679276).

Almost surely, 2^2857778157 is an apocalyptic number.

It is an amenable number.

2857778157 is a deficient number, since it is larger than the sum of its proper divisors (1286524467).

2857778157 is a wasteful number, since it uses less digits than its factorization.

2857778157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7129 (or 7026 counting only the distinct ones).

The product of its digits is 7683200, while the sum is 57.

The square root of 2857778157 is about 53458.1907381834. The cubic root of 2857778157 is about 1419.0885768380.

The spelling of 2857778157 in words is "two billion, eight hundred fifty-seven million, seven hundred seventy-eight thousand, one hundred fifty-seven".