28462781 has 2 divisors, whose sum is σ = 28462782. Its totient is φ = 28462780.

The previous prime is 28462769. The next prime is 28462787. The reversal of 28462781 is 18726482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17347225 + 11115556 = 4165^2 + 3334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28462781 is a prime.

It is a super-2 number, since 2×28462781² = 1620259804507922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28462787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14231390 + 14231391.

It is an arithmetic number, because the mean of its divisors is an integer number (14231391).

Almost surely, 2^28462781 is an apocalyptic number.

It is an amenable number.

28462781 is a deficient number, since it is larger than the sum of its proper divisors (1).

28462781 is an equidigital number, since it uses as much as digits as its factorization.

28462781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 38.

The square root of 28462781 is about 5335.0521084615. The cubic root of 28462781 is about 305.3227113711.

The spelling of 28462781 in words is "twenty-eight million, four hundred sixty-two thousand, seven hundred eighty-one".