65009640 has 64 divisors (see below), whose sum is σ = 205300800. Its totient is φ = 16422912.

The previous prime is 65009627. The next prime is 65009647. The reversal of 65009640 is 4690056.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 65009598 and 65009607.

It is not an unprimeable number, because it can be changed into a prime (65009647) 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, 11977 + ... + 16536.

It is an arithmetic number, because the mean of its divisors is an integer number (3207825).

Almost surely, 2^65009640 is an apocalyptic number.

65009640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65009640 is an abundant number, since it is smaller than the sum of its proper divisors (140291160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65009640 is a wasteful number, since it uses less digits than its factorization.

65009640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28546 (or 28542 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 65009640 is about 8062.8555735546. The cubic root of 65009640 is about 402.0924516950.

Adding to 65009640 its reverse (4690056), we get a palindrome (69699696).

The spelling of 65009640 in words is "sixty-five million, nine thousand, six hundred forty".