47878857 has 40 divisors (see below), whose sum is σ = 78974280. Its totient is φ = 28719360.

The previous prime is 47878813. The next prime is 47878867. The reversal of 47878857 is 75887874.

47878857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7733961 + 40144896 = 2781^2 + 6336^2 .

It is not a de Polignac number, because 47878857 - 2⁶ = 47878793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (47878807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 42619 + ... + 43727.

It is an arithmetic number, because the mean of its divisors is an integer number (1974357).

Almost surely, 2^47878857 is an apocalyptic number.

It is an amenable number.

47878857 is a deficient number, since it is larger than the sum of its proper divisors (31095423).

47878857 is a wasteful number, since it uses less digits than its factorization.

47878857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1175 (or 1166 counting only the distinct ones).

The product of its digits is 3512320, while the sum is 54.

The square root of 47878857 is about 6919.4549640850. The cubic root of 47878857 is about 363.1181228855.

The spelling of 47878857 in words is "forty-seven million, eight hundred seventy-eight thousand, eight hundred fifty-seven".