28445736321428 has 96 divisors (see below), whose sum is σ = 51741108357120. Its totient is φ = 13676685378560.

The previous prime is 28445736321421. The next prime is 28445736321439. The reversal of 28445736321428 is 82412363754482.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28445736321421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6373678325 + ... + 6373682787.

It is an arithmetic number, because the mean of its divisors is an integer number (538969878720).

Almost surely, 2^{28445736321428} is an apocalyptic number.

It is an amenable number.

28445736321428 is a deficient number, since it is larger than the sum of its proper divisors (23295372035692).

28445736321428 is a wasteful number, since it uses less digits than its factorization.

28445736321428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7757 (or 7755 counting only the distinct ones).

The product of its digits is 61931520, while the sum is 59.

The spelling of 28445736321428 in words is "twenty-eight trillion, four hundred forty-five billion, seven hundred thirty-six million, three hundred twenty-one thousand, four hundred twenty-eight".