65405540 has 12 divisors (see below), whose sum is σ = 137351676. Its totient is φ = 26162208.

The previous prime is 65405539. The next prime is 65405563. The reversal of 65405540 is 4550456.

It can be written as a sum of positive squares in 2 ways, for example, as 40883236 + 24522304 = 6394^2 + 4952^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1635119 + ... + 1635158.

It is an arithmetic number, because the mean of its divisors is an integer number (11445973).

Almost surely, 2^65405540 is an apocalyptic number.

It is an amenable number.

65405540 is an abundant number, since it is smaller than the sum of its proper divisors (71946136).

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

65405540 is a wasteful number, since it uses less digits than its factorization.

65405540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3270286 (or 3270284 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 65405540 is about 8087.3691643204. The cubic root of 65405540 is about 402.9070300926.

Adding to 65405540 its reverse (4550456), we get a palindrome (69955996).

The spelling of 65405540 in words is "sixty-five million, four hundred five thousand, five hundred forty".