28072053437 has 6 divisors (see below), whose sum is σ = 29820486138. Its totient is φ = 26420755904.

The previous prime is 28072053419. The next prime is 28072053473. The reversal of 28072053437 is 73435027082.

It can be written as a sum of positive squares in 3 ways, for example, as 19293487801 + 8778565636 = 138901^2 + 93694^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28072053437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28072053394 and 28072053403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28072053497) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48567278 + ... + 48567855.

It is an arithmetic number, because the mean of its divisors is an integer number (4970081023).

Almost surely, 2^28072053437 is an apocalyptic number.

It is an amenable number.

28072053437 is a deficient number, since it is larger than the sum of its proper divisors (1748432701).

28072053437 is an equidigital number, since it uses as much as digits as its factorization.

28072053437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97135167 (or 97135150 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 41.

The spelling of 28072053437 in words is "twenty-eight billion, seventy-two million, fifty-three thousand, four hundred thirty-seven".