28280448406428 has 24 divisors (see below), whose sum is σ = 65987799118080. Its totient is φ = 9426803825520.

The previous prime is 28280448406391. The next prime is 28280448406477. The reversal of 28280448406428 is 82460484408282.

It is a happy 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, 16382643 + ... + 18026421.

It is an arithmetic number, because the mean of its divisors is an integer number (2749491629920).

Almost surely, 2^{28280448406428} is an apocalyptic number.

It is an amenable number.

28280448406428 is an abundant number, since it is smaller than the sum of its proper divisors (37707350711652).

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

28280448406428 is a wasteful number, since it uses less digits than its factorization.

28280448406428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3077497 (or 3077495 counting only the distinct ones).

The product of its (nonzero) digits is 50331648, while the sum is 60.

The spelling of 28280448406428 in words is "twenty-eight trillion, two hundred eighty billion, four hundred forty-eight million, four hundred six thousand, four hundred twenty-eight".