28128355764 has 24 divisors (see below), whose sum is σ = 65685922848. Its totient is φ = 9368533920.

The previous prime is 28128355757. The next prime is 28128355769. The reversal of 28128355764 is 46755382182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28128355769) 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, 932622 + ... + 962309.

It is an arithmetic number, because the mean of its divisors is an integer number (2736913452).

Almost surely, 2^28128355764 is an apocalyptic number.

It is an amenable number.

28128355764 is an abundant number, since it is smaller than the sum of its proper divisors (37557567084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28128355764 is a wasteful number, since it uses less digits than its factorization.

28128355764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896175 (or 1896173 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 51.

It can be divided in two parts, 281283557 and 64, that added together give a triangular number (281283621 = T₂₃₇₁₈).

The spelling of 28128355764 in words is "twenty-eight billion, one hundred twenty-eight million, three hundred fifty-five thousand, seven hundred sixty-four".