28424947639 has 4 divisors (see below), whose sum is σ = 31009033800. Its totient is φ = 25840861480.

The previous prime is 28424947633. The next prime is 28424947679. The reversal of 28424947639 is 93674942482.

It is a happy number.

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 28424947639 - 2⁹ = 28424947127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28424947633) 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, 1292043064 + ... + 1292043085.

It is an arithmetic number, because the mean of its divisors is an integer number (7752258450).

Almost surely, 2^28424947639 is an apocalyptic number.

28424947639 is a deficient number, since it is larger than the sum of its proper divisors (2584086161).

28424947639 is a wasteful number, since it uses less digits than its factorization.

28424947639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2584086160.

The product of its digits is 20901888, while the sum is 58.

The spelling of 28424947639 in words is "twenty-eight billion, four hundred twenty-four million, nine hundred forty-seven thousand, six hundred thirty-nine".