278028712225 has 24 divisors (see below), whose sum is σ = 376403497920. Its totient is φ = 202037928000.

The previous prime is 278028712219. The next prime is 278028712229. The reversal of 278028712225 is 522217820872.

It is not a de Polignac number, because 278028712225 - 2¹¹ = 278028710177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (278028712229) 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 23 ways as a sum of consecutive naturals, for example, 73341 + ... + 749290.

It is an arithmetic number, because the mean of its divisors is an integer number (15683479080).

Almost surely, 2^278028712225 is an apocalyptic number.

278028712225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

278028712225 is a deficient number, since it is larger than the sum of its proper divisors (98374785695).

278028712225 is a wasteful number, since it uses less digits than its factorization.

278028712225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823881 (or 823876 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 46.

The spelling of 278028712225 in words is "two hundred seventy-eight billion, twenty-eight million, seven hundred twelve thousand, two hundred twenty-five".