28978428081 has 16 divisors (see below), whose sum is σ = 38709584640. Its totient is φ = 19283147520.

The previous prime is 28978428071. The next prime is 28978428091. The reversal of 28978428081 is 18082487982.

It is an interprime number because it is at equal distance from previous prime (28978428071) and next prime (28978428091).

It is not a de Polignac number, because 28978428081 - 2⁵ = 28978428049 is a prime.

It is a super-2 number, since 2×28978428081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28978428041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4558201 + ... + 4564553.

It is an arithmetic number, because the mean of its divisors is an integer number (2419349040).

Almost surely, 2^28978428081 is an apocalyptic number.

It is an amenable number.

28978428081 is a deficient number, since it is larger than the sum of its proper divisors (9731156559).

28978428081 is a wasteful number, since it uses less digits than its factorization.

28978428081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8936.

The product of its (nonzero) digits is 4128768, while the sum is 57.

The spelling of 28978428081 in words is "twenty-eight billion, nine hundred seventy-eight million, four hundred twenty-eight thousand, eighty-one".