28793081 has 2 divisors, whose sum is σ = 28793082. Its totient is φ = 28793080.

The previous prime is 28793077. The next prime is 28793099. The reversal of 28793081 is 18039782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20475625 + 8317456 = 4525^2 + 2884^2 .

It is a cyclic number.

It is not a de Polignac number, because 28793081 - 2² = 28793077 is a prime.

It is a super-2 number, since 2×28793081² = 1658083026945122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28793021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14396540 + 14396541.

It is an arithmetic number, because the mean of its divisors is an integer number (14396541).

Almost surely, 2^28793081 is an apocalyptic number.

It is an amenable number.

28793081 is a deficient number, since it is larger than the sum of its proper divisors (1).

28793081 is an equidigital number, since it uses as much as digits as its factorization.

28793081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28793081 is about 5365.9184675133. The cubic root of 28793081 is about 306.4992242555.

The spelling of 28793081 in words is "twenty-eight million, seven hundred ninety-three thousand, eighty-one".