28780528385535 has 16 divisors (see below), whose sum is σ = 46048956973920. Its totient is φ = 15349577953280.

The previous prime is 28780528385491. The next prime is 28780528385551. The reversal of 28780528385535 is 53558382508782.

It is not a de Polignac number, because 28780528385535 - 2⁷ = 28780528385407 is a prime.

It is a super-4 number, since 4×28780528385535⁴ (a number of 55 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 28780528385535.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4773175 + ... + 8963495.

It is an arithmetic number, because the mean of its divisors is an integer number (2878059810870).

Almost surely, 2^{28780528385535} is an apocalyptic number.

28780528385535 is a deficient number, since it is larger than the sum of its proper divisors (17268428588385).

28780528385535 is a wasteful number, since it uses less digits than its factorization.

28780528385535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4648218.

The product of its (nonzero) digits is 645120000, while the sum is 69.

The spelling of 28780528385535 in words is "twenty-eight trillion, seven hundred eighty billion, five hundred twenty-eight million, three hundred eighty-five thousand, five hundred thirty-five".