28020309375 has 48 divisors (see below), whose sum is σ = 49155603840. Its totient is φ = 14157540000.

The previous prime is 28020309371. The next prime is 28020309377. The reversal of 28020309375 is 57390302082.

It is not a de Polignac number, because 28020309375 - 2² = 28020309371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28020309371) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 99472 + ... + 256778.

It is an arithmetic number, because the mean of its divisors is an integer number (1024075080).

Almost surely, 2^28020309375 is an apocalyptic number.

28020309375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28020309375 is a deficient number, since it is larger than the sum of its proper divisors (21135294465).

28020309375 is an equidigital number, since it uses as much as digits as its factorization.

28020309375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157354 (or 157334 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The spelling of 28020309375 in words is "twenty-eight billion, twenty million, three hundred nine thousand, three hundred seventy-five".