28776537601 has 4 divisors (see below), whose sum is σ = 32887471552. Its totient is φ = 24665603652.

The previous prime is 28776537593. The next prime is 28776537613. The reversal of 28776537601 is 10673567782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10673567782 = 2 ⋅5336783891.

It is a cyclic number.

It is not a de Polignac number, because 28776537601 - 2³ = 28776537593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28776537661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2055466965 + ... + 2055466978.

It is an arithmetic number, because the mean of its divisors is an integer number (8221867888).

Almost surely, 2^28776537601 is an apocalyptic number.

It is an amenable number.

28776537601 is a deficient number, since it is larger than the sum of its proper divisors (4110933951).

28776537601 is an equidigital number, since it uses as much as digits as its factorization.

28776537601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4110933950.

The product of its (nonzero) digits is 2963520, while the sum is 52.

The spelling of 28776537601 in words is "twenty-eight billion, seven hundred seventy-six million, five hundred thirty-seven thousand, six hundred one".