28531029779 has 8 divisors (see below), whose sum is σ = 32612160768. Its totient is φ = 24451216200.

The previous prime is 28531029763. The next prime is 28531029797. The reversal of 28531029779 is 97792013582.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28531029779 - 2⁴ = 28531029763 is a prime.

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 28531029779.

It is not an unprimeable number, because it can be changed into a prime (28531029749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282497 + ... + 369954.

It is an arithmetic number, because the mean of its divisors is an integer number (4076520096).

Almost surely, 2^28531029779 is an apocalyptic number.

28531029779 is a deficient number, since it is larger than the sum of its proper divisors (4081130989).

28531029779 is an equidigital number, since it uses as much as digits as its factorization.

28531029779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658705.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The spelling of 28531029779 in words is "twenty-eight billion, five hundred thirty-one million, twenty-nine thousand, seven hundred seventy-nine".