28047372431 has 4 divisors (see below), whose sum is σ = 30204862632. Its totient is φ = 25889882232.

The previous prime is 28047372427. The next prime is 28047372439. The reversal of 28047372431 is 13427374082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13427374082 = 2 ⋅6713687041.

It is a cyclic number.

It is not a de Polignac number, because 28047372431 - 2² = 28047372427 is a prime.

It is a super-2 number, since 2×28047372431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28047372439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1078745081 + ... + 1078745106.

It is an arithmetic number, because the mean of its divisors is an integer number (7551215658).

Almost surely, 2^28047372431 is an apocalyptic number.

28047372431 is a deficient number, since it is larger than the sum of its proper divisors (2157490201).

28047372431 is a wasteful number, since it uses less digits than its factorization.

28047372431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157490200.

The product of its (nonzero) digits is 225792, while the sum is 41.

The spelling of 28047372431 in words is "twenty-eight billion, forty-seven million, three hundred seventy-two thousand, four hundred thirty-one".