28258256544 has 48 divisors (see below), whose sum is σ = 84774771648. Its totient is φ = 8073787392.

The previous prime is 28258256461. The next prime is 28258256549. The reversal of 28258256544 is 44565285282.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (28258256549) 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, 21024817 + ... + 21026160.

It is an arithmetic number, because the mean of its divisors is an integer number (1766141076).

Almost surely, 2^28258256544 is an apocalyptic number.

28258256544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28258256544 is an abundant number, since it is smaller than the sum of its proper divisors (56516515104).

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

28258256544 is a wasteful number, since it uses less digits than its factorization.

28258256544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42050997 (or 42050989 counting only the distinct ones).

The product of its digits is 6144000, while the sum is 51.

The spelling of 28258256544 in words is "twenty-eight billion, two hundred fifty-eight million, two hundred fifty-six thousand, five hundred forty-four".