28252394297 has 4 divisors (see below), whose sum is σ = 29226614820. Its totient is φ = 27278173776.

The previous prime is 28252394249. The next prime is 28252394311. The reversal of 28252394297 is 79249325282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79249325282 = 2 ⋅39624662641.

It can be written as a sum of positive squares in 2 ways, for example, as 10064904976 + 18187489321 = 100324^2 + 134861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28252394297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28252394497) 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, 487110218 + ... + 487110275.

It is an arithmetic number, because the mean of its divisors is an integer number (7306653705).

Almost surely, 2^28252394297 is an apocalyptic number.

It is an amenable number.

28252394297 is a deficient number, since it is larger than the sum of its proper divisors (974220523).

28252394297 is an equidigital number, since it uses as much as digits as its factorization.

28252394297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 974220522.

The product of its digits is 4354560, while the sum is 53.

The spelling of 28252394297 in words is "twenty-eight billion, two hundred fifty-two million, three hundred ninety-four thousand, two hundred ninety-seven".