28005505555278 has 16 divisors (see below), whose sum is σ = 56011539018960. Its totient is φ = 9335080533696.

The previous prime is 28005505555243. The next prime is 28005505555289. The reversal of 28005505555278 is 87255550550082.

It is a super-2 number, since 2×28005505555278² (a number of 28 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21304863 + ... + 22581146.

It is an arithmetic number, because the mean of its divisors is an integer number (3500721188685).

Almost surely, 2^{28005505555278} is an apocalyptic number.

28005505555278 is an abundant number, since it is smaller than the sum of its proper divisors (28006033463682).

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

28005505555278 is a wasteful number, since it uses less digits than its factorization.

28005505555278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43992371.

The product of its (nonzero) digits is 28000000, while the sum is 57.

The spelling of 28005505555278 in words is "twenty-eight trillion, five billion, five hundred five million, five hundred fifty-five thousand, two hundred seventy-eight".