28060781 has 12 divisors (see below), whose sum is σ = 32749920. Its totient is φ = 23972760.

The previous prime is 28060771. The next prime is 28060787. The reversal of 28060781 is 18706082.

It is not a de Polignac number, because 28060781 - 2⁶ = 28060717 is a prime.

It is a super-2 number, since 2×28060781² = 1574814860659922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28060787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17816 + ... + 19326.

It is an arithmetic number, because the mean of its divisors is an integer number (2729160).

Almost surely, 2^28060781 is an apocalyptic number.

It is an amenable number.

28060781 is a deficient number, since it is larger than the sum of its proper divisors (4689139).

28060781 is a wasteful number, since it uses less digits than its factorization.

28060781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904 (or 1897 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 28060781 is about 5297.2427733680. The cubic root of 28060781 is about 303.8784609085.

The spelling of 28060781 in words is "twenty-eight million, sixty thousand, seven hundred eighty-one".