65428389 has 12 divisors (see below), whose sum is σ = 101777676. Its totient is φ = 40263552.

The previous prime is 65428373. The next prime is 65428403. The reversal of 65428389 is 98382456.

It can be written as a sum of positive squares in 2 ways, for example, as 14062500 + 51365889 = 3750^2 + 7167^2 .

It is not a de Polignac number, because 65428389 - 2⁴ = 65428373 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65428309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 279492 + ... + 279725.

It is an arithmetic number, because the mean of its divisors is an integer number (8481473).

Almost surely, 2^65428389 is an apocalyptic number.

It is an amenable number.

65428389 is a deficient number, since it is larger than the sum of its proper divisors (36349287).

65428389 is a wasteful number, since it uses less digits than its factorization.

65428389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559236 (or 559233 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 65428389 is about 8088.7816758768. The cubic root of 65428389 is about 402.9539422804.

The spelling of 65428389 in words is "sixty-five million, four hundred twenty-eight thousand, three hundred eighty-nine".