28878620545 has 16 divisors (see below), whose sum is σ = 37473539328. Its totient is φ = 21281263360.

The previous prime is 28878620527. The next prime is 28878620567. The reversal of 28878620545 is 54502687882.

It is not a de Polignac number, because 28878620545 - 2⁹ = 28878620033 is a prime.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 3610351 + ... + 3618340.

It is an arithmetic number, because the mean of its divisors is an integer number (2342096208).

Almost surely, 2^28878620545 is an apocalyptic number.

It is an amenable number.

28878620545 is a deficient number, since it is larger than the sum of its proper divisors (8594918783).

28878620545 is a wasteful number, since it uses less digits than its factorization.

28878620545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7228760.

The product of its (nonzero) digits is 8601600, while the sum is 55.

The spelling of 28878620545 in words is "twenty-eight billion, eight hundred seventy-eight million, six hundred twenty thousand, five hundred forty-five".