28923898397 has 4 divisors (see below), whose sum is σ = 28924437276. Its totient is φ = 28923359520.

The previous prime is 28923898361. The next prime is 28923898433. The reversal of 28923898397 is 79389832982.

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 (28923898361) and next prime (28923898433).

It can be written as a sum of positive squares in 2 ways, for example, as 13071577561 + 15852320836 = 114331^2 + 125906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28923898397 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 (28923898307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178754 + ... + 299667.

It is an arithmetic number, because the mean of its divisors is an integer number (7231109319).

Almost surely, 2^28923898397 is an apocalyptic number.

It is an amenable number.

28923898397 is a deficient number, since it is larger than the sum of its proper divisors (538879).

28923898397 is an equidigital number, since it uses as much as digits as its factorization.

28923898397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538878.

The product of its digits is 94058496, while the sum is 68.

The spelling of 28923898397 in words is "twenty-eight billion, nine hundred twenty-three million, eight hundred ninety-eight thousand, three hundred ninety-seven".