28001570305801 has 9 divisors (see below), whose sum is σ = 28484534901351. Its totient is φ = 27526660503504.

The previous prime is 28001570305789. The next prime is 28001570305829. The reversal of 28001570305801 is 10850307510082.

The square root of 28001570305801 is 5291651.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 18428981824201 + 9572588481600 = 4292899^2 + 3093960^2 .

It is not a de Polignac number, because 28001570305801 - 2³⁵ = 27967210567433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28001570365801) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 312162565 + ... + 312252253.

Almost surely, 2^{28001570305801} is an apocalyptic number.

28001570305801 is the 5291651-st square number.

28001570305801 is the 2645826-th centered octagonal number.

It is an amenable number.

28001570305801 is a deficient number, since it is larger than the sum of its proper divisors (482964595550).

28001570305801 is an frugal number, since it uses more digits than its factorization.

28001570305801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179496 (or 89748 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 40.

Adding to 28001570305801 its reverse (10850307510082), we get a palindrome (38851877815883).

The spelling of 28001570305801 in words is "twenty-eight trillion, one billion, five hundred seventy million, three hundred five thousand, eight hundred one".