28087206957878 has 4 divisors (see below), whose sum is σ = 42130810436820. Its totient is φ = 14043603478938.

The previous prime is 28087206957871. The next prime is 28087206957889. The reversal of 28087206957878 is 87875960278082.

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

It is a junction number, because it is equal to n+sod(n) for n = 28087206957799 and 28087206957808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28087206957871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7021801739468 + ... + 7021801739471.

It is an arithmetic number, because the mean of its divisors is an integer number (10532702609205).

Almost surely, 2^{28087206957878} is an apocalyptic number.

28087206957878 is a deficient number, since it is larger than the sum of its proper divisors (14043603478942).

28087206957878 is a wasteful number, since it uses less digits than its factorization.

28087206957878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14043603478941.

The product of its (nonzero) digits is 1517322240, while the sum is 77.

The spelling of 28087206957878 in words is "twenty-eight trillion, eighty-seven billion, two hundred six million, nine hundred fifty-seven thousand, eight hundred seventy-eight".