65309985 has 24 divisors (see below), whose sum is σ = 121913064. Its totient is φ = 32152320.

The previous prime is 65309983. The next prime is 65309999. The reversal of 65309985 is 58990356.

It can be written as a sum of positive squares in 4 ways, for example, as 88209 + 65221776 = 297^2 + 8076^2 .

It is not a de Polignac number, because 65309985 - 2¹ = 65309983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 65309985.

It is not an unprimeable number, because it can be changed into a prime (65309983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55236 + ... + 56405.

It is an arithmetic number, because the mean of its divisors is an integer number (5079711).

Almost surely, 2^65309985 is an apocalyptic number.

65309985 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

65309985 is a deficient number, since it is larger than the sum of its proper divisors (56603079).

65309985 is a wasteful number, since it uses less digits than its factorization.

65309985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111665 (or 111662 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 45.

The square root of 65309985 is about 8081.4593360358. The cubic root of 65309985 is about 402.7107238603.

The spelling of 65309985 in words is "sixty-five million, three hundred nine thousand, nine hundred eighty-five".