28680578957 has 4 divisors (see below), whose sum is σ = 28681394940. Its totient is φ = 28679762976.

The previous prime is 28680578951. The next prime is 28680578963. The reversal of 28680578957 is 75987508682.

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

It is an interprime number because it is at equal distance from previous prime (28680578951) and next prime (28680578963).

It can be written as a sum of positive squares in 2 ways, for example, as 9676853641 + 19003725316 = 98371^2 + 137854^2 .

It is a cyclic number.

It is not a de Polignac number, because 28680578957 - 2⁸ = 28680578701 is a prime.

It is a super-2 number, since 2×28680578957² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28680578893 and 28680578902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28680578951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352778 + ... + 426395.

It is an arithmetic number, because the mean of its divisors is an integer number (7170348735).

Almost surely, 2^28680578957 is an apocalyptic number.

It is an amenable number.

28680578957 is a deficient number, since it is larger than the sum of its proper divisors (815983).

28680578957 is an equidigital number, since it uses as much as digits as its factorization.

28680578957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815982.

The product of its (nonzero) digits is 67737600, while the sum is 65.

The spelling of 28680578957 in words is "twenty-eight billion, six hundred eighty million, five hundred seventy-eight thousand, nine hundred fifty-seven".