28424439651 has 4 divisors (see below), whose sum is σ = 37899252872. Its totient is φ = 18949626432.

The previous prime is 28424439649. The next prime is 28424439677. The reversal of 28424439651 is 15693442482.

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

It is not a de Polignac number, because 28424439651 - 2¹ = 28424439649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28424439651.

It is not an unprimeable number, because it can be changed into a prime (28424439611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4737406606 + ... + 4737406611.

It is an arithmetic number, because the mean of its divisors is an integer number (9474813218).

Almost surely, 2^28424439651 is an apocalyptic number.

28424439651 is a deficient number, since it is larger than the sum of its proper divisors (9474813221).

28424439651 is an equidigital number, since it uses as much as digits as its factorization.

28424439651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9474813220.

The product of its digits is 1658880, while the sum is 48.

The spelling of 28424439651 in words is "twenty-eight billion, four hundred twenty-four million, four hundred thirty-nine thousand, six hundred fifty-one".