28321745438 has 8 divisors (see below), whose sum is σ = 48551563632. Its totient is φ = 12137890896.

The previous prime is 28321745411. The next prime is 28321745503. The reversal of 28321745438 is 83454712382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 28321745392 and 28321745401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1011490895 + ... + 1011490922.

It is an arithmetic number, because the mean of its divisors is an integer number (6068945454).

Almost surely, 2^28321745438 is an apocalyptic number.

28321745438 is a deficient number, since it is larger than the sum of its proper divisors (20229818194).

28321745438 is a wasteful number, since it uses less digits than its factorization.

28321745438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022981826.

The product of its digits is 1290240, while the sum is 47.

The spelling of 28321745438 in words is "twenty-eight billion, three hundred twenty-one million, seven hundred forty-five thousand, four hundred thirty-eight".