28394501 has 2 divisors, whose sum is σ = 28394502. Its totient is φ = 28394500.

The previous prime is 28394479. The next prime is 28394507. The reversal of 28394501 is 10549382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23668225 + 4726276 = 4865^2 + 2174^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28394501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28394507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14197250 + 14197251.

It is an arithmetic number, because the mean of its divisors is an integer number (14197251).

Almost surely, 2^28394501 is an apocalyptic number.

It is an amenable number.

28394501 is a deficient number, since it is larger than the sum of its proper divisors (1).

28394501 is an equidigital number, since it uses as much as digits as its factorization.

28394501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 28394501 is about 5328.6490783312. The cubic root of 28394501 is about 305.0783673926.

The spelling of 28394501 in words is "twenty-eight million, three hundred ninety-four thousand, five hundred one".