28932997549 has 4 divisors (see below), whose sum is σ = 29045577564. Its totient is φ = 28820417536.

The previous prime is 28932997507. The next prime is 28932997573. The reversal of 28932997549 is 94579923982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94579923982 = 2 ⋅47289961991.

It can be written as a sum of positive squares in 2 ways, for example, as 28532277225 + 400720324 = 168915^2 + 20018^2 .

It is a cyclic number.

It is not a de Polignac number, because 28932997549 - 2¹¹ = 28932995501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28932997589) 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, 56289622 + ... + 56290135.

It is an arithmetic number, because the mean of its divisors is an integer number (7261394391).

Almost surely, 2^28932997549 is an apocalyptic number.

It is an amenable number.

28932997549 is a deficient number, since it is larger than the sum of its proper divisors (112580015).

28932997549 is a wasteful number, since it uses less digits than its factorization.

28932997549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112580014.

The product of its digits is 88179840, while the sum is 67.

The spelling of 28932997549 in words is "twenty-eight billion, nine hundred thirty-two million, nine hundred ninety-seven thousand, five hundred forty-nine".