65278789 has 2 divisors, whose sum is σ = 65278790. Its totient is φ = 65278788.

The previous prime is 65278757. The next prime is 65278819. The reversal of 65278789 is 98787256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51365889 + 13912900 = 7167^2 + 3730^2 .

It is a cyclic number.

It is not a de Polignac number, because 65278789 - 2⁵ = 65278757 is a prime.

It is a super-2 number, since 2×65278789² = 8522640586613042, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65278189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32639394 + 32639395.

It is an arithmetic number, because the mean of its divisors is an integer number (32639395).

Almost surely, 2^65278789 is an apocalyptic number.

It is an amenable number.

65278789 is a deficient number, since it is larger than the sum of its proper divisors (1).

65278789 is an equidigital number, since it uses as much as digits as its factorization.

65278789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 52.

The square root of 65278789 is about 8079.5290085499. The cubic root of 65278789 is about 402.6465939800.

The spelling of 65278789 in words is "sixty-five million, two hundred seventy-eight thousand, seven hundred eighty-nine".