28938621551 has 16 divisors (see below), whose sum is σ = 35623907328. Its totient is φ = 22960713600.

The previous prime is 28938621527. The next prime is 28938621571. The reversal of 28938621551 is 15512683982.

It is a cyclic number.

It is not a de Polignac number, because 28938621551 - 2¹⁸ = 28938359407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28938621551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28938621571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2894090 + ... + 2904071.

It is an arithmetic number, because the mean of its divisors is an integer number (2226494208).

Almost surely, 2^28938621551 is an apocalyptic number.

28938621551 is a deficient number, since it is larger than the sum of its proper divisors (6685285777).

28938621551 is a wasteful number, since it uses less digits than its factorization.

28938621551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5798222.

The product of its digits is 1036800, while the sum is 50.

The spelling of 28938621551 in words is "twenty-eight billion, nine hundred thirty-eight million, six hundred twenty-one thousand, five hundred fifty-one".