28428248939 has 4 divisors (see below), whose sum is σ = 28458460560. Its totient is φ = 28398037320.

The previous prime is 28428248923. The next prime is 28428248971. The reversal of 28428248939 is 93984282482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28428248939 - 2⁴ = 28428248923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28428241939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15104399 + ... + 15106280.

It is an arithmetic number, because the mean of its divisors is an integer number (7114615140).

Almost surely, 2^28428248939 is an apocalyptic number.

28428248939 is a deficient number, since it is larger than the sum of its proper divisors (30211621).

28428248939 is an equidigital number, since it uses as much as digits as its factorization.

28428248939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30211620.

The product of its digits is 15925248, while the sum is 59.

The spelling of 28428248939 in words is "twenty-eight billion, four hundred twenty-eight million, two hundred forty-eight thousand, nine hundred thirty-nine".