28970422849 has 3 divisors (see below), whose sum is σ = 28970593057. Its totient is φ = 28970252642.

The previous prime is 28970422801. The next prime is 28970422861. The reversal of 28970422849 is 94822407982.

It is a happy number.

The square root of 28970422849 is 170207.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 94822407982 = 2 ⋅47411203991.

It is not a de Polignac number, because 28970422849 - 2¹³ = 28970414657 is a prime.

It is a super-2 number, since 2×28970422849² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28970422849.

It is not an unprimeable number, because it can be changed into a prime (28970422879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 85104 + ... + 255310.

Almost surely, 2^28970422849 is an apocalyptic number.

28970422849 is the 170207-th square number.

28970422849 is the 85104-th centered octagonal number.

It is an amenable number.

28970422849 is a deficient number, since it is larger than the sum of its proper divisors (170208).

28970422849 is an frugal number, since it uses more digits than its factorization.

28970422849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340414 (or 170207 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 55.

The spelling of 28970422849 in words is "twenty-eight billion, nine hundred seventy million, four hundred twenty-two thousand, eight hundred forty-nine".