28278224928 has 162 divisors, whose sum is σ = 83733044031. Its totient is φ = 9400390848.

The previous prime is 28278224921. The next prime is 28278224929. The reversal of 28278224928 is 82942287282.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

28278224928 is a `hidden beast` number, since 2 + 82 + 78 + 2 + 2 + 492 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14139112464 + 14139112464 = 118908^2 + 118908^2 .

It is a tau number, because it is divible by the number of its divisors (162).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=118908.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (4128768) is a multiple of the sum of its prime factors (768).

It is not an unprimeable number, because it can be changed into a prime (28278224921) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 77052201 + ... + 77052567.

Almost surely, 2^28278224928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28278224928

28278224928 is an abundant number, since it is smaller than the sum of its proper divisors (55454819103).

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

28278224928 is an frugal number, since it uses more digits than its factorization.

28278224928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768 (or 372 counting only the distinct ones).

The product of its digits is 4128768, while the sum is 54.

The spelling of 28278224928 in words is "twenty-eight billion, two hundred seventy-eight million, two hundred twenty-four thousand, nine hundred twenty-eight".