28058004781 has 4 divisors (see below), whose sum is σ = 28213021564. Its totient is φ = 27902988000.

The previous prime is 28058004769. The next prime is 28058004817. The reversal of 28058004781 is 18740085082.

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 12123991881 + 15934012900 = 110109^2 + 126230^2 .

It is a cyclic number.

It is not a de Polignac number, because 28058004781 - 2²¹ = 28055907629 is a prime.

It is a super-2 number, since 2×28058004781² (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 (28058004731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77508120 + ... + 77508481.

It is an arithmetic number, because the mean of its divisors is an integer number (7053255391).

Almost surely, 2^28058004781 is an apocalyptic number.

It is an amenable number.

28058004781 is a deficient number, since it is larger than the sum of its proper divisors (155016783).

28058004781 is a wasteful number, since it uses less digits than its factorization.

28058004781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155016782.

The product of its (nonzero) digits is 143360, while the sum is 43.

The spelling of 28058004781 in words is "twenty-eight billion, fifty-eight million, four thousand, seven hundred eighty-one".