28297814345761 has 27 divisors (see below), whose sum is σ = 29549858046579. Its totient is φ = 27097884486000.

The previous prime is 28297814345747. The next prime is 28297814345777. The reversal of 28297814345761 is 16754341879282.

The square root of 28297814345761 is 5319569.

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., 27188204921361 + 1109609424400 = 5214231^2 + 1053380^2 .

It is not a de Polignac number, because 28297814345761 - 2¹⁷ = 28297814214689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28297814345861) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 16655569690 + ... + 16655571388.

Almost surely, 2^{28297814345761} is an apocalyptic number.

28297814345761 is the 5319569-th square number.

28297814345761 is the 2659785-th centered octagonal number.

It is an amenable number.

28297814345761 is a deficient number, since it is larger than the sum of its proper divisors (1252043700818).

28297814345761 is an frugal number, since it uses more digits than its factorization.

28297814345761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3662 (or 1831 counting only the distinct ones).

The product of its digits is 162570240, while the sum is 67.

The spelling of 28297814345761 in words is "twenty-eight trillion, two hundred ninety-seven billion, eight hundred fourteen million, three hundred forty-five thousand, seven hundred sixty-one".