28780783201 has 3 divisors (see below), whose sum is σ = 28780952851. Its totient is φ = 28780613552.

The previous prime is 28780783181. The next prime is 28780783211. The reversal of 28780783201 is 10238708782.

The square root of 28780783201 is 169649.

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.

It can be written as a sum of positive squares in only one way, i.e., 10241237601 + 18539545600 = 101199^2 + 136160^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28780783201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28780783211) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 84825 + ... + 254473.

Almost surely, 2^28780783201 is an apocalyptic number.

28780783201 is the 169649-th square number.

28780783201 is the 84825-th centered octagonal number.

It is an amenable number.

28780783201 is a deficient number, since it is larger than the sum of its proper divisors (169650).

28780783201 is an frugal number, since it uses more digits than its factorization.

28780783201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339298 (or 169649 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 46.

The spelling of 28780783201 in words is "twenty-eight billion, seven hundred eighty million, seven hundred eighty-three thousand, two hundred one".