28450509997 has 108 divisors (see below), whose sum is σ = 39169823616. Its totient is φ = 20570397120.

The previous prime is 28450509991. The next prime is 28450510009. The reversal of 28450509997 is 79990505482.

It is not a de Polignac number, because 28450509997 - 2³¹ = 26303026349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28450509991) 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 107 ways as a sum of consecutive naturals, for example, 92672518 + ... + 92672824.

It is an arithmetic number, because the mean of its divisors is an integer number (362683552).

Almost surely, 2^28450509997 is an apocalyptic number.

It is an amenable number.

28450509997 is a deficient number, since it is larger than the sum of its proper divisors (10719313619).

28450509997 is a wasteful number, since it uses less digits than its factorization.

28450509997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 377 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 58.

The spelling of 28450509997 in words is "twenty-eight billion, four hundred fifty million, five hundred nine thousand, nine hundred ninety-seven".