28531029778 has 8 divisors (see below), whose sum is σ = 42825290940. Its totient is φ = 14255932800.

The previous prime is 28531029763. The next prime is 28531029797. The reversal of 28531029778 is 87792013582.

It can be written as a sum of positive squares in 2 ways, for example, as 25846028289 + 2685001489 = 160767^2 + 51817^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4787323 + ... + 4793278.

Almost surely, 2^28531029778 is an apocalyptic number.

28531029778 is a deficient number, since it is larger than the sum of its proper divisors (14294261162).

28531029778 is a wasteful number, since it uses less digits than its factorization.

28531029778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9582092.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 28531029778 in words is "twenty-eight billion, five hundred thirty-one million, twenty-nine thousand, seven hundred seventy-eight".