65390540 has 24 divisors (see below), whose sum is σ = 138121200. Its totient is φ = 26003648.

The previous prime is 65390537. The next prime is 65390543. The reversal of 65390540 is 4509356.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (65390537) and next prime (65390543).

It is a junction number, because it is equal to n+sod(n) for n = 65390497 and 65390506.

It is not an unprimeable number, because it can be changed into a prime (65390543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5990 + ... + 12909.

It is an arithmetic number, because the mean of its divisors is an integer number (5755050).

Almost surely, 2^65390540 is an apocalyptic number.

It is an amenable number.

65390540 is an abundant number, since it is smaller than the sum of its proper divisors (72730660).

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

65390540 is a wasteful number, since it uses less digits than its factorization.

65390540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19081 (or 19079 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 65390540 is about 8086.4417391087. The cubic root of 65390540 is about 402.8762270571.

Adding to 65390540 its reverse (4509356), we get a palindrome (69899896).

The spelling of 65390540 in words is "sixty-five million, three hundred ninety thousand, five hundred forty".