65628309 has 16 divisors (see below), whose sum is σ = 90713088. Its totient is φ = 42176112.

The previous prime is 65628307. The next prime is 65628317. The reversal of 65628309 is 90382656.

It is not a de Polignac number, because 65628309 - 2¹ = 65628307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65628301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5974 + ... + 12920.

It is an arithmetic number, because the mean of its divisors is an integer number (5669568).

Almost surely, 2^65628309 is an apocalyptic number.

It is an amenable number.

65628309 is a deficient number, since it is larger than the sum of its proper divisors (25084779).

65628309 is a wasteful number, since it uses less digits than its factorization.

65628309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7064.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 65628309 is about 8101.1301063494. The cubic root of 65628309 is about 403.3639408657.

The spelling of 65628309 in words is "sixty-five million, six hundred twenty-eight thousand, three hundred nine".