28773497 has 2 divisors, whose sum is σ = 28773498. Its totient is φ = 28773496.

The previous prime is 28773473. The next prime is 28773509. The reversal of 28773497 is 79437782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23222761 + 5550736 = 4819^2 + 2356^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28773497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28773427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14386748 + 14386749.

It is an arithmetic number, because the mean of its divisors is an integer number (14386749).

Almost surely, 2^28773497 is an apocalyptic number.

It is an amenable number.

28773497 is a deficient number, since it is larger than the sum of its proper divisors (1).

28773497 is an equidigital number, since it uses as much as digits as its factorization.

28773497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 47.

The square root of 28773497 is about 5364.0933064219. The cubic root of 28773497 is about 306.4297186428.

The spelling of 28773497 in words is "twenty-eight million, seven hundred seventy-three thousand, four hundred ninety-seven".