28728571461 has 16 divisors (see below), whose sum is σ = 38774346240. Its totient is φ = 18917685360.

The previous prime is 28728571331. The next prime is 28728571471. The reversal of 28728571461 is 16417582782.

It is a happy number.

It is not a de Polignac number, because 28728571461 - 2¹⁸ = 28728309317 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28728571471) 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 15 ways as a sum of consecutive naturals, for example, 1639416 + ... + 1656846.

It is an arithmetic number, because the mean of its divisors is an integer number (2423396640).

Almost surely, 2^28728571461 is an apocalyptic number.

It is an amenable number.

28728571461 is a deficient number, since it is larger than the sum of its proper divisors (10045774779).

28728571461 is a wasteful number, since it uses less digits than its factorization.

28728571461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24136.

The product of its digits is 1505280, while the sum is 51.

The spelling of 28728571461 in words is "twenty-eight billion, seven hundred twenty-eight million, five hundred seventy-one thousand, four hundred sixty-one".