28766425557 has 16 divisors (see below), whose sum is σ = 39432578112. Its totient is φ = 18640016640.

The previous prime is 28766425553. The next prime is 28766425573. The reversal of 28766425557 is 75552466782.

It is not a de Polignac number, because 28766425557 - 2² = 28766425553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28766425497 and 28766425506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28766425553) 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 15 ways as a sum of consecutive naturals, for example, 25668 + ... + 241229.

It is an arithmetic number, because the mean of its divisors is an integer number (2464536132).

Almost surely, 2^28766425557 is an apocalyptic number.

It is an amenable number.

28766425557 is a deficient number, since it is larger than the sum of its proper divisors (10666152555).

28766425557 is a wasteful number, since it uses less digits than its factorization.

28766425557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267908.

The product of its digits is 28224000, while the sum is 57.

The spelling of 28766425557 in words is "twenty-eight billion, seven hundred sixty-six million, four hundred twenty-five thousand, five hundred fifty-seven".