2878861157 has 4 divisors (see below), whose sum is σ = 2908540236. Its totient is φ = 2849182080.

The previous prime is 2878861099. The next prime is 2878861187. The reversal of 2878861157 is 7511688782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2127607876 + 751253281 = 46126^2 + 27409^2 .

It is a cyclic number.

It is not a de Polignac number, because 2878861157 - 2¹⁸ = 2878599013 is a prime.

It is a super-4 number, since 4×2878861157⁴ (a number of 39 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2878861099 and 2878861108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2878861187) 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, 14839394 + ... + 14839587.

It is an arithmetic number, because the mean of its divisors is an integer number (727135059).

Almost surely, 2^2878861157 is an apocalyptic number.

It is an amenable number.

2878861157 is a deficient number, since it is larger than the sum of its proper divisors (29679079).

2878861157 is an equidigital number, since it uses as much as digits as its factorization.

2878861157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29679078.

The product of its digits is 1505280, while the sum is 53.

The square root of 2878861157 is about 53655.0198676694. The cubic root of 2878861157 is about 1422.5697626715.

The spelling of 2878861157 in words is "two billion, eight hundred seventy-eight million, eight hundred sixty-one thousand, one hundred fifty-seven".