28072430405 has 4 divisors (see below), whose sum is σ = 33686916492. Its totient is φ = 22457944320.

The previous prime is 28072430383. The next prime is 28072430411. The reversal of 28072430405 is 50403427082.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6863459716 + 21208970689 = 82846^2 + 145633^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28072430405 is a prime.

It is a super-2 number, since 2×28072430405² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

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, 2807243036 + ... + 2807243045.

It is an arithmetic number, because the mean of its divisors is an integer number (8421729123).

Almost surely, 2^28072430405 is an apocalyptic number.

It is an amenable number.

28072430405 is a deficient number, since it is larger than the sum of its proper divisors (5614486087).

28072430405 is an equidigital number, since it uses as much as digits as its factorization.

28072430405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5614486086.

The product of its (nonzero) digits is 53760, while the sum is 35.

Adding to 28072430405 its reverse (50403427082), we get a palindrome (78475857487).

The spelling of 28072430405 in words is "twenty-eight billion, seventy-two million, four hundred thirty thousand, four hundred five".